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Best King Memory Foam Mattress: An Exclusive Size for All-Night Comfort

Updated April 5, 2021

Memory foam has been a popular bedding option since it was first introduced to the mattress industry in the 1990s. Created for unparalleled weight response, it helps cushion joints and provides a customized sleep experience.

Advances in technology have made it even better than ever, and the wide range of options available to you for an excellent night’s sleep can be found right here. Take a look at some of our top picks for a king size memory foam mattress and take the leg work out of your research.

Rank Product Highlights
#1

eLuxurySupply Gel Memory Foam 10 Inch Mattress

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  • Memory Foam Layer Height: 1 inch
  • Warranty and Trial: 10 years full coverage, 120-night trial
  • Features: gel infusion, bamboo removable cover, dense base layer, bed-in-box-style for easy set-up, excellent warranty and sleep trial
#2

Layla Sleep Copper Infused Memory Foam King Mattress

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  • Memory Foam Layer Height: 1 to 3 inches
  • Warranty and Trial: Lifetime warranty and 120-night sleep trial
  • Features: Thick copper infused memory foam, cooling properties, thick cover, dual-sided comfort.
#3

Brentwood Home Cypress Classic Cooling Charcoal Infused Memory Foam Mattress

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  • Memory Foam Layer Height: 3 inches
  • Warranty and Trial:  25 years and a 120-night trial
  • Features: 3-inch memory foam layer, charcoal infusion, cooling properties, ventilated layer, profile hight choices, breathable cover
#4

AMERISLEEP AS1 Memory Foam Mattress

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  • Memory Foam Layer Height: 3 inches
  • Warranty and Trial: 20 years and 100 nights
  • Features: 3-inch memory foam, layered for airflow, environmentally friendly, good selection of firmness levels
#5

TUFT & NEEDLE – Original King Adaptive Foam Mattress

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  • Memory Foam Layer Height: 3 inches
  • Warranty and Trial: 10 years, 1-00 night trial
  • Features: graphite and blue gel infusion for cooling and health, supportive foam layers, bed-in-box design

Memory Foam Comfort Review

Memory foam is an attractive sleep surface due to its unique feel. It is a compressible foam that contours to your body weight and shape to provide a customized feel. This feature offers cushioning and support to sore joints, and keeps pressure pain from occurring. And because it comes in varying degrees of density, there is a foam just about all types of body needs.

The heat of your body is what helps soften the foam for a personal conforming feel. This also helps bring your body into proper alignment while you sleep each night, no matter whether you sleep on your side, back, stomach, or move through the night.

Many early complaints about memory foam surrounding the heat retention is caused due to the close cellular structure, thus trapping your body heat in the area around you. Advances in design and foam infusions have made this practice a non-issue except for the hottest of sleepers, who can easily add a cooling mattress topper to their favorite memory foam bed to help offset this issue.

A Note on Memory Foam Mattress Design

Memory foam is dense and heavy, and so when considering a memory foam mattress, you need to understand you aren’t purchasing a big block of memory foam. Rather, you will be exposed to various layers of memory foam and other materials, such as durable poly foams, latex, and even enclosed innerspring systems.

How these mattresses are layered can produce various comfort effects, and you will find the memory foam within the top layer, as well as possible layers beneath to help maximize the support you need. These layers are also supportive of airflow, and work with gel infusions and layer designs to maximize cooling effects.

Memory Foam Firmness and Indentation Load Explained

Most companies provide a chart for their mattress comfort levels to give you an idea of whether they are more soft, plush, or firm to meet your needs. These firmness levels have a lot to do with how the mattresses are both made, and the indentation load deflection (ILD) of the memory foam layers. The ILD scale refers to how much foam is compressed under a specific amount of weight. Lower numbers (25 and lower) offer a softer feel, while a more firm, slower to respond feel will be above 30.

Density

The density of memory foam is different from the ILD and provides more of an idea of the quality of foam you are purchasing. For memory foam comfort layers, look for a choice that offers 4 to 5 pounds for cubic feet which relates to its ability to last longer and bounce back without permanently becoming compressed and less responsive over time.

What to Take into Account

There are a few things to take into account when shopping for the perfect memory foam mattress. How you sleep, your comfort levels, and the size of bed you truly need are all worth thinking about before committing to a purchase.

What Size Bed is Needed?

Although you think you want a king-size mattress, do you need it? If you sleep alone, this might not be the best choice for you, especially since a king mattress is often significantly more expensive than smaller sizes. If you sleep with a partner, and you both are larger, or find yourself struggling from a personal room, then a king mattress may be perfect. Otherwise, you might want to shop for a queen option to save some cash.

What Position Do You Sleep In?

Your sleep position will determine the firmness level you require. Firmer options are best for back and stomach sleepers to help keep the spine in proper alignment. You don’t want your torso or hips to sing and create unnatural curves while you sleep. Side sleepers may want a bit more give, and look for a plush or softer choice to help conform to the shoulders and hips to better support an aligned spine from the side.

Do You Know Which Type of Memory Foam is Best for You?

There are a few types of memory foam to help with overall comfort. Traditional memory foam layers are designed for cushioning and increased circulation, but may hold more heat than what is comfortable. If heat retention is a concern of yours, look for gel infusion, which helps draw heat from your body; or layers that include air channels for increased air circulation.

Best King Memory Foam Mattresses 

The following king mattress picks are affordable, easy to set up without a huge, bulky hassle- and are popular with consumers due to their quality and comfort. Although they represent a small amount of what is out there, these are some of our online favorites.

eLuxurySupply Gel Memory Foam 10 Inch Mattress

Specs:

  • Memory Foam Layer Height: 1 inch
  • Warranty and Trial: 10 years full coverage, 120-night trial
  • Features: gel infusion, bamboo removable cover, dense base layer, bed-in-box-style for easy set-up, excellent warranty and sleep trial

Best Cooling King Memory Foam

eLuxurySupply offers some of the best in the bedding industry at quality prices. If you sleep hot, then you’ll appreciate this option as the 10-inch profile offers a full inch of gel-infused memory foam for excellent body-conforming and incredible cooling capabilities. This top layer is all you need to help cushion your joints without creating a deep sink or sacrificing the underlying firmness that helps support your whole body.

The bamboo woven cover is removable, and helps increase breathability and airflow to work with the gel to create uneven cooler night’s sleep. The high-density base foam is durable and long-lasting to provide you with years of sleep and comfort.

Pros

  • Sleeps very cool and comfortable
  • No off-gassing when setting up
  • Great quality for the price point

Cons

  • Poor edge support

Who Should Purchase This

This is a great choice for anyone in need of a cool sleep, excellent joint support, and who wants a friendly priced item to work with.

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Layla Sleep Copper Infused Memory Foam King Mattress

Specs:

  • Memory Foam Layer Height: 1 to 3 inches
  • Warranty and Trial: Lifetime warranty and 120-night sleep trial
  • Features: Thick copper infused memory foam, cooling properties, thick cover, dual-sided comfort.

Best Copper Infused King Memory Foam Mattress

Copper-infused items claim they increase blood circulation, thus bringing better oxygen and nutrients to the areas of your body that most need it. This is a great option for athletes and those recovering from injury as well. This dual-sided mattress also allows you to flip it to customize the firmness level and help elongate the life of your mattress.

This 10-inch mattress offers a 1 to 3 inch infused memory foam for body comfort and contouring depending on the side you choose for sleep on. The copper is also cooling, antimicrobial, and antibacterial for a more healthy rest overall. Covered by a thermo- gel-infused fabric, it is a thick, plush, yet breathable surface that helps create a more enjoyable night.

Pros

  • Excellent firmness choices
  • Incredible cover and cooling properties
  • Easy to set up (bed-on-box)

Cons

  • Flipping is difficult and bulky

Who Should Purchase This

If you prefer a cooling, healthy sleep environment, this is the mattress for you. With the ability to choose your comfort level, this is a durable, long-lasting option.

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Brentwood Home Cypress Classic Cooling Charcoal Infused Memory Foam Mattress

Specs:

  • Memory Foam Layer Height: 3 inches
  • Warranty and Trial:  25 years and a 120-night trial
  • Features: 3-inch memory foam layer, charcoal infusion, cooling properties, ventilated layer, profile hight choices, breathable cover

Best Charcoal Infused King Memory Foam Mattress

Not only do Brentwood mattresses have a great price point, but their Cypress Classic mattress is also infused with charcoal to provide temperature, moisture, and microbe control. Sleep cooler and with peace of mind as body moisture is wicked away and dissipated while heat is also pulled away to create a better sleep environment. It is also layered with a ventilated foam for increased airflow.

The naturally antimicrobial properties also help keep molds or mildew from getting started, and allow for healthy sleep. Available in 11 and 13 in deep choices, the top layer is responsive memory foam for incredible body support. The cover is also breathable to make sure you can fully enjoy the mattress comfort.

Pros

  • Great price point
  • Great comfort
  • Sleep cool

Cons

  • Poor edge support

Who Should Purchase This

A healthy sleep surface and budget-friendly experience await you with Brentwood mattresses. They offer a quality, long-lasting product.

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AMERISLEEP AS1 Memory Foam Mattress

Specs:

  • Memory Foam Layer Height: 3 inches
  • Warranty and Trial: 20 years and 100 nights
  • Features: 3-inch memory foam, layered for airflow, environmentally friendly, good selection of firmness levels

Most Eco-Friendly, Memory Foam King Mattress

Amerisleep has long been known for its eco-friendly approaches and the plant-based memory foam has 3-inch thick support without sacrificing durability. Layered above 2 breathable foam choices of varying density for comfortable body support, they help circulate air and provide a cooler sleep. The dense base foam is durable and long-lasting.

Covered by a cooling Cellient, thermo-reactive cover, it can be removed for washing and serves as excellent mattress protection. Available in varying firmness levels, choose the best for your needs to help you be encompassed in soft foam and supported through the night.

Pros

  • No motion transfer
  • Construction is durable
  • Great comfort surface

Cons

  • May create heat sinks

Who Should Purchase This

Anyone with environmental concerns will appreciate this mattress option as it offers a wide range of firmness options to choose from. It also is a quality pick with great customer service.

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TUFT & NEEDLE – Original King Adaptive Foam Mattress

Specs:

  • Memory Foam Layer Height: 3 inches
  • Warranty and Trial: 10 years, 1-00 night trial
  • Features: graphite and blue gel infusion for cooling and health, supportive foam layers, bed-in-box design

Best Bed-In-Box King Memory Foam Mattress

Tuft & Needle was one of the first companies to offer a bed-in-box mattress for manufacturers to consumer direct shipping to help save on cost. This revolutionary idea has exploded, but the company still offers its original design for an excellent price point and incredible quality. Made from highly adaptive memory foam, has cooling graphite and blue gel infusion for a more comfortable night’s sleep.

The 3-inch memory foam layer contours to your body shape and weight for a weightless feeling that helps cushion your joints. Plus, the open-cell structured foam provides continuous air-flow to help dissipate body heat and moisture. The graphite further helps create a healthier sleep environment.

Pros

  • Supportive and joint cushioning
  • Cooling and comfortable
  • Great airflow

Cons

  • It may be too firm for some

Who Should Purchase This

This mattress offers a medium-firm feel, a healthy sleep environment, a cooler sleep surface, and a great price point for anyone in need of one or all of those features.

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You might be interested also in: The Best King Memory Foam Mattress

Conclusion

If a king size mattress is on your list of needs or wants, these are great choices that won’t break the bank while offering a comfortable, supportive memory foam sleep surface. Everything from tried and true brands that helped launch bed-in-box style designs, to charcoal and cooling gel infusions for a more comfortable night’s rest are available.