2020's Best King Size Mattress (Reviewed & Compared)

If you’re looking for the best king size mattress, you’re in the right place.

This article reviews the qualities of several mattress brands. Each of them has unique qualities that are great for many types of sleepers.

You’ll find:

  • ✔ How we chose the best king size mattress brands in 2020
  • ✔ Individual reviews of the best mattress picks
  • ✔ A useful guide to buying mattresses


Best Deals On King Size Mattress Sets

1. Saatva

Ease of movement

Multiple firmness levels

Good pressure distribution

Best For Back Pains

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Saatva mattresses offer plenty of choices for people with different sleeping preferences. You can select different firmness levels, sizes, and heights. Its materials help reduce back and joint pains, and let you sleep with more freedom in your movements. Its reputation is top-notch, garnering several awards and largely positive reviews from consumers.

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2. Nectar

Longer trial period

Budget-friendly + free items

Pressure-relieving properties

Best For Heavy Sleepers

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Nectar ranks among the best king mattress brands for memory foams due to its high-quality feel and inexpensiveness. Its materials are perfect for heavy sleepers and offer pressure-relieving functions, so it’s best for the back, stomach, and side sleepers who want to avoid body pain. Warranty doesn’t expire and shipping is free, plus you get free premium sheets, mattress protectors, and pillows.

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3. Casper Original

Excellent airflow

Zoned support layer

Balanced, responsive memory foam

Best For Back Sleepers

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Casper is the best king size mattress for you if you love the balanced and responsive feel that its zoned support memory foam offers. Its zoned layer offers softer foam on the shoulders and head and firmer foam at the hips, improving spine alignment and support. Airflow is also excellent, and it’s easy to move around.

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4. Lucid

Very affordable

Gel, latex, or hybrid

Eco-friendly sleep material

Best Price King Size Mattress

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Lucid offers a wide variety of mattresses for different needs and preferences. The best-seller is the 10-inch Gel Memory Foam Mattress, perfect for memory foam lovers and side sleepers. Its materials allow for excellent pressure relief as well as airflow, keeping the mattress cool throughout the night. It’s also priced lower than many other brands, making it the best cheap king size mattress around.

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5. Helix Midnight Luxe

Minimal motion transfer

Excellent cooling technology

Pressure relief and lumbar support

Best For Side Sleepers

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Helix Midnight Luxe is a premium king size bed mattress offering excellent pressure relief and contouring. It’s a foam-and-coil hybrid that allows for excellent body support, breathability, and temperature control. You’ll enjoy a 15-year warranty and 100 nights of sleep trial, as well as free shipping anywhere in the continental US.

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Cool and breathable

Excellent pressure-relieving support

Best Overall

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Amerisleep AS3 is the best king size mattress for memory foam lovers who want coolness and great temperature control. It’s made of eco-friendly Bio-Pur materials and has a great support layer for better pressure relief, so it’s suitable for almost any type of sleeper. Its warranty period of 20 years is longer than those of many other brands.

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7. Nolah

Good motion isolation and pressure relief

Great contouring and durability

Excellent temperature control

Most Responsive And Eco-Friendly

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Nolah Original king size mattresses offer great cooling and temperature control for side and back sleepers. It’s also a good king size mattress for pressure relief and stability. Side and back sleepers will love its responsive feel and core support. You’ll also find it cheaper than many other good mattress brands.

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8. Tuft & Needle


Foamy yet sturdy

Great for all types of sleepers

Best For Combination Sleepers

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Tuft & Needle Original king size mattress offers a foamy yet sturdy feel and a comfortable, airy feel. Its proprietary Adaptive foam is also infused with soft-solid cooling gels and graphite, further improving its breathability. It’s also a lot cheaper than other same-grade mattresses, making it a top pick for consumers and buyers.

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9. Leesa

Great edge support

Premium hybrid materials

Perfect contouring and pressure relief

Best For Stomach Sleepers

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The Leesa Hybrid mattress provides comfort and motion transfer for back and stomach sleepers, with an airy feel and great edge support so you won’t fall off the side. It has premium foams for cooling and contouring, while the pocketed springs provide advanced support and stability.

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10. Puffy

Lifetime warranty

Great “hugging” feel

Great temperature control

Best Soft-Grade Mattress

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This Puffy model is the best king size mattress if you love the hugging feel of memory foams and want to avoid the noise of squeaking coils. It’s comfortable and fits all kinds of sleepers. It’s also more affordable than other premium mattress brands and comes with a lifetime warranty.

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How We Created The List - Our Methodology

Some mattresses are made from better materials than others, while some are suitable for specific types of sleepers. So how did we pick the mattresses we reviewed? We used the following criteria:

✔ Materials – We discuss the types of materials used in each mattress. These materials can be polyfoams, memory foams, coils, or a combination of them.

✔ Ease of Maintenance – We also look into the ease of maintenance of each mattress. How much cleaning do they require and how do their materials affect the ease of cleaning?

✔ Comfort & Ergonomics – You may find one mattress comfortable, but another person might find it too soft or firm. We review what type of mattress is best for which type of sleeper.

✔ Durability – We also evaluate the durability of each mattress. Some of them may last for years while others are not that sturdy.

✔ Shipping, trial period, return policy – You’ll also learn about different mattresses’ shipping, trial period, and warranty. We considered which ones have the most reasonable terms relating to these factors.

✔ Certifications & Awards – We cite king mattress ratings and criticisms when applicable. We also take note of the awards and certifications each one gets. Some of them have garnered numerous awards, while others are starting to build their good reputation.

✔ Reputation & Customer Satisfaction (User reviews) – We also take note if customers have something important to say about the mattresses. Their reviews can be very useful in finding out whether some things need to be taken into consideration when buying a mattress.

✔ Price & Value – We also consider your budget. The prices differ per brand and size. Both the cheapest and the most expensive mattresses have something great to offer in value. So you’ll surely find the best deals on king size mattress sets here.

At a Glance

  • Good pressure distribution
  • Ease of movement
  • Multiple firmness levels
  • Movement isolation is average
  • Loud inflation/deflation

Saatva mattresses come from Saatva, the manufacturing company that also produces Loom and Leaf and Zenhaven mattresses. Saatva offers the best king-size mattress for pressure relief while also letting consumers enjoy a variety of choices and cheaper pricing.

Saatva Classic

Saatva Classic comes in three firmness levels:

  • Plush Soft
  • Luxury Firm
  • Firm

Saatva combines two layers of coils and polyfoam with a thin layer of memory foam. The Plush Soft and Luxury Firm mattresses have 1.25 inches of soft polyfoam. The Firm type uses 1.5 inches of firm polyfoam. All types use Euro-top sewn-in cushions.

Saatva mattress prices range from $799 for the Twin size to $1,999 for Split California King. Saatva offers a 15-year warranty, with a 180-night trial period.

Many users praise the Saatva mattresses’ durability and pressure-relief properties. The mattresses have active wire support in the center, allowing for optimal spinal alignment. However, they don’t isolate movements thoroughly; movements result in more bounces.

Saatva mattresses got the Sustainability Product of the Year award for 2018 and the 2020 Best Bedding Award. It sports a seal of approval from the Congress of Chiropractic State Associations.

Overall, Saatva mattresses are perfect for those searching for the best king size mattress for back pain. The materials fit well for people with various firmness preferences, while the prices, warranty, and trial period give great value for your money.

Type Innerspring
Size Twin, Twin XL, Full, Queen, King, Split King, California King, Split California King
Cost $1,799
Warranty 15 years
Trial 180 nights
Shipping Free in the US

At a Glance

  • Forever Warranty
  • Longer trial period
  • Pressure-relieving properties
  • Budget-friendly + free items
  • Too firm for lightweight sleepers
  • May trap too much body heat

The Nectar Mattress is among the best king size memory foam mattress options offering premium-quality mattresses for heavy sleepers. The pricing, trial period, and warranty offers are super budget-friendly, too.

Nectar Memory Foam Mattresses

The mattress has a medium firmness, 11-inch thickness, and a two-part comfort system. It consists of two layers of memory foam.

A 1.75-inch heavier memory foam serves as a transition layer, supporting your body while giving the bed some bounce. The materials help contour the body and offer a “no-pressure” feel when sleeping. It’s perfect if you’re a back, stomach, or side sleeper.

Nectar’s king size mattresses start at $999. Other available sizes are Twin, Twin XL, Full, Queen, and Cal King.

The sleep trial period is 365 days. There’s a Forever Warranty coverage, plus free shipping. You also receive free items like mattress protectors, sheets, and premium pillows.

Nectar’s best rated king size mattress offerings also garnered awards. Nectar received the Best Memory Foam Mattress 2020 award from the Sleep Foundation. USA Today named it the Best Overall Mattress for 2020, while Mattress Advisor gave it the Best Value Mattress award in 2019.

Overall, if you don’t mind a less bouncy mattress but a firm, premium-quality one suits you, Nectar Mattress is perfect for you. It offers firmness, pressure relief, and budget-friendly deals that are hard to resist.

Type Memory Foam
Size Twin, Twin XL, Full, Queen, King, California King
Cost $999
Warranty Forever (for the original owner)
Trial 365 days
Shipping Free in the US

At a Glance

  • Balanced, responsive memory foam
  • Excellent airflow
  • Zoned support layer
  • Poor edge support
  • Not for heavy sleepers

Casper Original offers targeted spinal alignment support. Its proprietary Airscape breathable foam improves airflow and circulation, and the foam conforms to your body to relieve pressure. It’s one of the best king size bed mattresses if you want that combination of support and temperature control.

Casper Original King Size Mattress

The cover is made of knit polyester, giving it a soft and stretchy, “no-pressure” feel. The top layer contains aerated foam that responds slowly to pressure, which gives pressure relief at the shoulder and hips. The aerations help prevent overheating.

Below that layer is the zoned support layer, which consists of softer foam for the shoulders and firmer foam at the hips. This division helps to align your spine better. The base is made of high-density polyfoam that provides shape and stability to the whole mattress.

The Casper Original king size mattress costs $1,101. For $1,271, you can upgrade it to Hybrid, which adds 7 inches of pocketed coils to the structure for a more bouncy feel. You’ll enjoy a 100-night sleep trial and a 10-year warranty, plus free shipping across the US.

This king size foam mattress has been reviewed by many big names, such as CNN, which noted that it provides more airflow than a typical mattress. Men’s Health said it’s the “best-comfort pick for your back.”

Overall, a Casper Original king size mattress is perfect if you’re a back sleeper who prefers a balanced, responsive foam feel. Sleeping on this mattress makes it easy to move around and feel comfortable.

Type Memory foam
Size Twin, Twin XL, Full, Queen, King, California King
Cost $1,101
Warranty 10 years
Trial 100 nights
Shipping Free in the US

At a Glance

  • 10-year warranty
  • Inexpensive
  • Eco-friendly sleep material
  • Can be gel, latex, or hybrid
  • Not ideal for sleepers weighing over 230 pounds
  • Short sleep trial

Lucid offers a user-focused approach to mattresses. A wide variety of mattresses — from plush to firm and natural latex to memory foams — are available. You’re bound to find a king size mattress that will fit your preferences.

Lucid 10-Inch Gel Memory Foam

When selecting mattresses, you can sort Lucid mattresses by price, feel, comfort, bedroom, or materials. For comfort and feel, you can choose from:

  • Firm
  • Medium-firm
  • Medium plush
  • Plush

Bedroom options are Master Bedroom, Guest Bedroom, and Kids Bedroom. Materials are gel-infused foams, latex, and hybrid.

The most popular choice and best seller is the 10-inch Gel Memory Foam. The cover is Tencel, an environment-friendly material used as an organic cotton substitute. It has a 3-inch gel memory foam that provides airflow and cooling. Under that is the dense poly foam that gives the mattress shape and stability.

The Lucid 10-inch Gel Memory foam is available in Twin to California King sizes, from $275 to $425, perfect for budget-conscious buyers. The warranty is 10 years, while shipping is free. Foam critics and reviewers have praised Lucid mattresses, describing them as something worth trying.

Lucid is among the best king size mattress manufacturers for you if you love memory foam and you’re on a budget. And even if you don’t like 10-inch Gel Memory Foam, Lucid has a plethora of other options for you to choose from.

Type Gel Memory Foam
Size Twin, Twin XL, Full, Queen, King, California King
Cost $425
Warranty 10 years
Trial 30 nights
Shipping Free in the US

At a Glance

  • Long warranty period
  • Minimal motion transfer
  • Pressure relief and lumbar support
  • Excellent cooling technology
  • Expensive
  • Not suitable for those who prefer all-foam mattresses

Midnight Luxe is the premium line of mattresses by Helix Sleep. It’s the most popular option from Helix’s other offerings, which include the Moonlight, Dusk, Twilight, and Dawn models. The Midnight Luxe is designed as an all-in offering with lots of premium features and upgrade options.

King Size Helix Midnight Luxe

Helix Midnight Luxe is the best premium king size mattress for side sleepers. The model sports Helix’s proprietary Ultra-Cool phase-changing cover, and under that is a gel-and-coil hybrid.

Its zoned lumbar springs support your hips and shoulders. Meanwhile, its gel memory foam layer allows for more satisfying pressure relief. Another memory foam layer helps extend body-contouring even deeper into the mattress. The gel inside and pocketed springs improve airflow and temperature.

All materials have OEKO-TEX and Certi-PUR certification.

The king size Midnight Luxe costs $2,049. You get two Helix Dream pillows for free, and you can purchase mattress protectors, foundation, and frame for $99, $399, and $175, respectively. Helix offers a 100-night sleep trial and a 15-year warranty. Shipping is free.

The mattress has been described as the “most comfortable mattress in 2019” by CNN. It’s also been praised by the likes of Wall Street Journal, GQ, Allure, Business Insider, and Cosmopolitan.

Overall, Helix Midnight Luxe is the perfect king bed mattress if you have pressure-point pains and want great temperature regulation. It has minimal motion transfer, so it’s great for couples, too, as your movements won’t wake or disturb your partner.

Type Gel and coil hybrid
Size Twin, Twin XL, Full, Queen, King, California King
Cost $2,049
Warranty 15 years
Trial 100 nights
Shipping Free in the US

At a Glance

  • Long warranty period
  • Excellent pressure-relieving support
  • Eco-friendly
  • Cool and breathable
  • Only one firmness level
  • Limited bounce

Amerisleep AS3 is Amerisleep’s best-selling memory foam mattress. It can accommodate almost any type of sleeper with its medium firmness, offering a mix of comfort and pressure relief. It’s also made with plant-based sleep material that’s cool and allows for ventilation.

Amerisleep AS3 

Amerisleep AS3 is made of plant-based Bio-Pur memory foam, which helps in heat distribution and keeps you cool at night. It wicks away hot air and is more naturally breathable than traditional foam. It’s also very eco-friendly and uses minimal non-renewable resources.

Also, the medium-firm Amerisleep AS3 provides support for side, back, and stomach sleepers. The materials also minimize sagging. Its open-cell structure has a transition layer that reacts to your body position to evenly support your weight.

The AS3 king size mattress cost is $1,329.30. You get free Amerisleep pillows for the purchase and a risk-free, 100-night trial. The warranty is for 20 years — a lot longer than other brands’. Shipping is free.

Amerisleep AS3 has also been recognized by many important names in the industry. It has been rated the Best Memory Foam Mattress of 2020 by SleepFoundation.org. It has an average of 4.7 stars from 15,000+ reviews. It has also been praised by Forbes and Allure.

Overall, Amerisleep provides a great sleeping experience for almost any type of sleeper. If you’re a hot sleeper, you’ll love its naturally ventilated memory foam. It’s eco-friendly and has great pressure-relieving properties, too.

Type Memory Foam
Size Twin, Twin XL, Full, Queen, King, California King
Cost $1,329.30
Warranty 20 years
Trial 100 nights
Shipping Free in the US

At a Glance

  • Great for side and back sleepers
  • Good motion isolation and pressure relief
  • Great contouring and durability
  • Excellent temperature control
  • Sleep trial includes a mandatory break-in period of 30 days
  • Not ideal for heavy sleepers

Nolah is a budget-friendly, all-foam mattress brand that’s best for side sleepers. You’ll also want to try it if you are prone to back pains and you want the cool feel of an all-poly foam mattress.

Nolah Original 10 King Size Mattress

The Nolah Original Mattress has a 2-inch layer of AirFoam polyfoam, the brand’s proprietary comfort material that makes it one of the best king size mattress options for back pain. The low-density AirFoam conforms closely to your body and has great cooling properties.

Below the AirFoam is a 1-inch transitional layer of high-density polyfoam. This layer keeps you from sinking too deeply into the bed. The support core is also made of high-density polyfoam that’s 7 inches thick. This last layer provides long-term stability to the mattress.

This king size mattress is $999 upfront, or you can pay monthly at $84. You can enjoy 120 nights of free trial and a 15-year warranty, plus free shipping and returns.

Nolah has a great reputation among customers and reviewers. It has received positive feedback from Men’s Journal and Apartment Therapy, which both praised its naturally ventilated feel. Tuck described it as the “ideal mattress for side and back sleepers,” while Mattress Clarity named it the Most Comfortable Mattress for Side Sleepers in 2020.

Overall, if you want the coolness and the responsive feel of an all-polyfoam mattress, with relief from back pains and pressure points, Nolah is a good pick.

Type Polyfoam
Size Twin, Twin XL, Full, Queen, King, California King
Cost $999
Warranty 15 years
Trial 120 nights
Shipping Free in the US

At a Glance

  • Great for all types of sleepers
  • Inexpensive
  • Foamy yet sturdy
  • Breathable
  • Not suitable for heavier sleepers
  • Only two layers of foam

If you love a foamy-yet-stable feel, minus the sinking sensation that all-foam mattresses usually give, Tuft & Needle may be the brand for you. It also has a simple two-layer design that works for all kinds of sleepers.

Tuft & Needle Original King Size Mattress

The cover is made of polyester that has a thin, naturally breathable feel. Beneath it is the brand’s 3-inch proprietary Adaptive foam, which responds quickly to pressure and offers plenty of bounce. The Adaptive foam is infused with cooling gels and graphite, which help regulate body heat.

The base is a 7-inch high density foam for stability and support. It has an open-cell design that further makes the whole mattress breathable. The whole structure is compatible with most bed frames.

Its firmness is on the soft-to-firm scale. So if you’re a heavier sleeper, you might sink right through the comfort layer and feel some discomfort.

The Tuft & Needle Original king size mattress costs $675, which is a lot cheaper than other brands. You can enjoy a 100-night sleep trial and a 10-year warranty. Shipping is free in the continental US.

Buzzfeed noted that the online community “absolutely adores” the brand, while Architectural Digest said it provides a “luxuriously supportive sleep.”

Overall, the Tuft & Needle Original king size mattress is the best price king size mattress. It’s cheap and has a comfortable, airy feel that suits all types of sleepers. The brand is also a charitable one, giving out over $13 million in direct product donations and school fundraising programs.

Type Poly foams
Size Twin, Twin XL, Full, Queen, King, California King
Cost $675
Warranty 10 years
Trial 100 nights
Shipping Free in the US

Check Also: Tuft & Needle Original Mattress Reviews

At a Glance

  • Perfect contouring and pressure relief
  • Great edge support
  • Premium hybrid materials
  • Not suitable for couples
  • Not suitable for side sleepers

Leesa Hybrid mattresses offer a luxurious feel thanks to the premium memory foam and dual, pocketed spring design. It also offers terrific pressure relief and edge-to-edge support for back and stomach sleepers.

Leesa Hybrid King Size Mattress

The 11-inch thick Leesa Hybrid mattress ranks among the best king-size hybrid mattresses around. It contains more than 1,000 6-inch inner springs for bounce and three layers of foam above them for pressure relief.

The top layer is a 1.5-inch polyfoam with a 3-pounds-per-cubic-foot density, generating a combination of bounce and firmness. Beneath it is 1.5-inch memory foam for pressure relief. Then there’s an inch of polyfoam that stops you from sinking into the bed.

Below three layers of poly foams lies the support core, which is a six-inch layer of thick springs wrapped in cloth. This setup reduces motion transfer, which is a common problem among innerspring mattresses.

The last layer is a 1-inch support polyfoam that helps with shock absorption and overall long-term stability.

The Leesa Hybrid king size mattress costs $1,549 upfront or $54 per month. It has a 10-year warranty, a 100-night sleep trial, and free, no contract shipping.

Mattress Advisor commends the design of the Leesa Hybrid mattress, while WireCutter says the design offers a great balance between coil-on-coil system and foam mattresses. Mattress Advisor also features the product among the top-rated hybrid mattresses on the market.

The hybrid design offers enough amounts of bounce and firmness suitable for you if you move a lot when you sleep. Overall, the mattress is a top-rated king size mattress for single back and stomach sleepers.

Type Hybrid
Size Twin, Twin XL, Full, Queen, King, California King
Cost $1,549
Warranty 10 years
Trial 100 nights
Shipping Free in the US

At a Glance

  • Affordable
  • Lifetime warranty
  • Great “hugging” feel
  • Great temperature control
  • Lacks bounce
  • Slower inflation

Puffy Mattress is an all-foam mattress that offers a soft, cushiony feel and contouring. You’ll appreciate the “hug” of the mattress as well as its budget-friendliness since it’s a little cheaper than many other brands.

Puffy King Size Mattress

The top layer is the gel-infused Cooling Cloud memory foam, which cradles the body and provides cushioning. Memory foams often trap heat, but gel-infused foams help reduce heat. The design also provides reinforcement along the edges for better support.

The second layer is a 2-inch Cloud Climate transitional foam. This layer is softer than the support core but firmer than the top layer. It also promotes spine alignment and offers great pressure relief for pain. This quality makes the Puffy Mattress one of the best king size mattress options for lower back pain.

The next layer is the Firm Core support base made of high-density polyfoam. This bed base provides support for most types of sleepers. It has a medium-firm feel, which adequately supports sleepers between 130 to 230 pounds.

This mattress costs $1,050, which is cheaper than many other brands. You get a free King Pillow, a 101-night sleep trial, and a lifetime warranty. Shipping and returns are also free.

Puffy King Size mattress reviews praise the mattress’ other qualities: it’s non-hypoallergenic and staining isn’t a problem. The Cooling Gel Cloud layer also proves to be optimized for better temperature control.

Overall, the Puffy King Size mattress is a great choice if you love the “hug” of memory foam and prefer the quietness of an all-foam mattress to the excessive squeaking of innerspring mattresses.

Type Memory Foam
Size Twin, Twin XL, Full, Queen, King, California King
Cost $1,050
Warranty Lifetime
Trial 101 nights
Shipping Free in the US

Check Also: Puffy Lux Mattress Reviews

Best King Size Mattress At A Glance

King Size Mattress Buyer’s Guide

Here’s a quick, useful guide to getting the best bang for your buck when buying mattresses.

How to Choose a King-Size Mattress?

To get the best deal on your king size mattress, think about the following factors. These things range from your sleeping position to your total budget.

✔ Preferred sleeping position – Not all mattresses can service your sleeping position well. Some provide a thicker comfort layer for back and stomach sleepers, while others are more suited for side sleepers.

✔ Materials and construction – The most common materials are polyfoams, memory foams, innerspring (coils), and combinations of these things. Depending on their construction, the mattresses may provide different levels of comfort, support, and temperature control.

✔ Size and Airflow – Think about the size and how much airflow you want. Sizes include Twin, Twin XL, Queen, King, and California King. Meanwhile, some mattresses are naturally breathable, while others trap too much heat and don’t have sufficient airflow.

✔ Level of firmness and support – The level of firmness is measured on a 1-10 scale, where 1 is the softest and 10 is the firmest. Most mattresses are between 3 and 8. Comfort layers are usually 10, while transitional and support layers have a much higher firmness level.

✔ Additional features – You must search for specific qualities that can affect your overall mattress experience. Is the mattress hypoallergenic? Does it regulate temperature well? What free stuff can you get when you buy it?

✔ Shipping, warranties, returns, and trials – Most mattress brands ship for free in the continental US. Warranties typically last for years, while trial nights last for hundreds of days. Choose a mattress with the most reasonable perks and bonuses.

✔ Budget – Your budget should be able to cover the mattress. King size mattresses often cost thousands of dollars. You might find some king mattress models on sale. Many brands offer financing options if you can’t pay the full price at once.

Types of King Size Mattresses - Size, Material & Firmness

Mattresses can be made of different materials and have different firmness levels. Sizes also matter. King size mattresses, for example, have size variations that suit different types of people.

King Size Mattress – Size Variations 

Not all king size mattresses are created equal. Some are good for heavy sleepers while others are better for taller people. Some are great for people with back pains, thanks to great pressure distribution.

King (aka Eastern King)

The king size mattress dimensions are 76” x 80”. It’s best for couples who want maximum personal space when sleeping. So if you’re a combination sleeper and you switch positions often, but you sleep with a partner, this is the best choice for you.

California King

The California king mattress dimensions are 72” x 84”, which makes it more suitable for taller people or for bedrooms with narrower designs. If you’re a back and stomach sleeper and more than 6 ft. tall, this is a better option than a king size mattress.

Split King 

The split king size has the same 76” x 80” dimensions as the king size mattress, but its design allows the sides of the mattress to be raised or lowered simultaneously. It can accommodate couples and give each person their own position and sleep setting.

Mattress Material 

Mattresses can also differ according to the materials used. Choosing the most comfortable king size mattress for your taste may depend on which materials the mattress is made of, which may be one or a combination of the following:

Memory Foam Mattress

Memory foams use your body heat to soften and take your shape. So there’s that sinking sensation when you lie down. Once pressure is removed, the foam will bounce back slowly. A high-quality memory foam mattress has good weight distribution, so pressure points are reduced, which is great if you suffer from body pains and aches.

Latex Foam Mattress

Natural latex foam mattresses are similar to memory foam mattresses in that they “remember” your optimal sleeping position. However, latex foams are more durable than memory foams. Organic latex foam comes from rubber tree sap and has little to no additional chemicals. Many latex foam brands also use natural materials such as wool and organic cotton. It’s bouncier than memory foams and more customizable. Plus, it’s naturally cooling.

Hybrid Mattress

A hybrid mattress combines memory foam, latex, and gel along with innerspring systems. If you want to experience both pressure relief and the sturdiness of spring mattresses, then hybrid mattresses can do the job. They also have better breathability, temperature regulation, support, responsiveness, and balance.

Innerspring Mattress 

Innerspring mattresses use a steel coil support system that may be covered in pads or upholstery layers, such as foams, fiber, and even additional layers of spring systems. Pocketed springs are wrapped individually and can provide better responsiveness, so you might want to look into innerspring mattress options if you struggle with pressure point pains.

Mattress Firmness Level

Mattress firmness describes the comfort or softness of the mattress’s surface. The actual firmness will depend on your height, weight, sleeping position, and personal preferences. Generally, though, mattress firmness is rated on a 1-10 scale, where 1 is the softest and 10 is the firmest.


Soft mattresses have a firmness grade of 1 to 3. The best soft king size mattress is one that’s good for you if you weigh under 230 pounds and want a more snug surface. This is also good for you if you’re a side sleeper since you’ll need more contouring to avoid pains and pressure at the shoulders and hips.

Medium Soft

Medium soft mattresses have a firmness grade of 3 to 4. This grade is typically good enough for combination side-and-back sleepers. The body weight is distributed evenly, which is good for back sleepers, while the medium softness also lets side sleepers get comfortable.

Medium Firm

If you switch positions throughout the night, medium-firm mattresses are a great option. With a firmness grade of 5 to 6, medium-firm mattresses have better weight distribution than soft mattresses. They also regulate temperature better.


Firm mattresses are those with a grade of more than 6. A firm mattress keeps your lower back from collapsing. It’s also generally better for stomach and back sleepers since it has a more stable and even surface.

Key Takeouts and FAQs

Overall, king size mattresses offer differing levels of comfort, and the choice will depend on your sleeping position, height, and weight. The best king size mattress deals often provide great stability along with pressure relief and budget-friendliness. Make sure you check out all the top brands listed here before deciding which mattress to buy.


What is CertiPUR-US certification?

A CertiPUR-US certification means the mattress has substances that are free of ozone depleting substances, heavy metals, formaldehyde, BPDE (Polybrominated Diphenyl Ethers) in fire retardants, and volatile organic compounds. 

A certified mattress does not adversely affect the air quality inside your home allowing you to enjoy a more comfortable sleep. 

What makes a king size mattress more comfortable than smaller sized mattresses?

A king-size mattress accommodates couples who want to have more room and personal space. 

King size mattresses are often 10 inches thick or more, which increases the overall comfort and support you’ll enjoy while sleeping or relaxing. 

How much does a king size mattress cost?

A king size mattress can cost anywhere between a few hundred dollars to a few thousand. The cheapest on our list is the Lucid 10-Inch Gel Memory Foam at $425, while the most expensive is the King Size Helix Midnight Luxe at $2,049. 

The best king size mattress offers a balance between price, comfort, and durability. So, buy wisely.