Menu

The Best King Memory Foam Mattress

Candace Osmond

There are plenty of reasons why foam mattresses are a must-have for a variety of different sleepers. There is no other material with better contouring properties, so foam beds are excellent when it comes to pressure point relief as well. It also excels in motion isolation, being one of the best mattresses for couples that share a bed. Because they are cost-effective and extremely popular, today we’re going to cover foam mattresses in-depth and then analyze some of the best King memory foam mattresses on the market.

RankProductHighlights
#1

Bear

BUY NOW

Read Our Review

  • Available sizes: Twin, Twin XL, Full, Queen, King, Cal King
  • Mattress height: 10 inches
#2

Leesa Original

BUY NOW

Read Our Review

  • Available sizes: Twin, Twin XL, Full, Queen, King, Cal King
  • Mattress height: 11 inches
#3Plank

BUY NOW

  • Available sizes: Twin, Twin XL, Full, Queen, King, Cal King, Split Cal King, Short Full, Short Queen, Short King, Olympic Queen, three RV King sizes
  • Mattress height: 11.5 inches
#4

Layla

Use SLEEPJUDGE for $100 Off

Read Our Review

  • Available sizes: Twin, Twin XL, Full, Queen, King, Cal King
  • Mattress height: 10 inches
#5

Loom & Leaf

BUY NOW

Read Our Review

 

  • Available sizes: Twin, Twin XL, Full, Queen, King, Cal King, Split King, Split Cal King
  • Mattress height: 12 inches

Foam Density 101

When you’re shopping for a foam mattress, you will often find reviews that give you information about the density of the foam, so it’s important to understand more about it. Foam density is measured in PCF (pounds per cubic foot) and it’s a reflection of the weight of one cubic foot of foam. To get the PCF, you can divide the weight of the foam layer to its measurement in cubic feet. That means that a 100-pound mattress that measures 25 cubic feet will have 4 PCF in density.

Mattresses these days are typically made with one of these two types of foam:

  • Polyfoam (also known as flexible polyurethane foam) is a material obtained through the combination of isocyanate and polyol petrochemicals. It is fairly inexpensive and is used in the construction of the mattress typically in the base or support layers of the bed. Some mattresses also use polyfoam in the top layers of their construction.
  • Memory foam (which is also known as viscoelastic polyurethane foam) is designed to be softer and, therefore, can’t be used as a support or base layer, so it’s typically added into the comfort layers of the mattress. Memory foam uses the heat of your body to contour to its shape and then returns to its original form when it cools down (which is typically when you get out of bed).

Another thing that you should know about foam density is the fact that it can be low, medium, or high-density. Low and medium-density foams are typically a part of a mattress’s upper layers, while high-density foam is more commonly found in the support and base layers of the bed. Even if the density is used in the evaluation of both memory foam and polyfoam, the ranges are very different:

  • Polyfoam layers with low-density have less than 1.5 PCF, those with medium-density have from 1.5 PCF to 1.7 PCF, while high-density layers have more than 1.7 PCF.
  • Memory foam layers with low-density have less than 4 PCF, those with medium-density have from 4 PCF to 5 PCF, while high-density layers have more than 5 PCF.

Density & Mattress Quality

Needless to say, there is a direct correlation between the density of the foam used and the different qualities and properties of a mattress. Here are the variables one must consider:

  • Low-density foam leads to a less durable mattress, as it is more likely to sag and shows early signs of wear and tear. Mattresses with low-density foam layers aren’t as contouring as others, but they offer a decent amount of pressure relief. This type of foam is less likely to retain heat and is often used in the comfort layers of mattresses designed for hot sleepers. They are also good at motion isolation and make minimal noise when switching from one sleeping position to another or when getting in and out of bed. Mattresses that have low-density foam also cost less.
  • Medium-density foam creates a mattress with higher durability compared to the previous type. They are used to make mattresses better at conforming and they also provide a decent amount of pressure relief. When it comes to temperature neutrality, layers made with medium-density foam are likely to absorb body heat and might not be the best choice for people who tend to sleep hot. They are very good at motion isolation and have low noise potential. They have a moderate price and tend to make the mattress heavier.
  • High-density foam has the longest lifespan of all and comes with great conforming properties because it can hug the sleeper’s body properly since the foam is so responsive to body heat. They are excellent for people who suffer from different kinds of pain because they offer excellent pressure point relief. However, they also tend to retain body heat a lot, which makes them less desirable for people who tend to sleep hot. They excel in chapters such as motion isolation and keeping noise to a minimum, but they also tend to be a part of the most expensive foam mattresses on the market.

Best King-Size Foam Mattresses

With all this talk about density, it’s time to look at some of the best King-size foam mattresses available this year. We’ve emphasized the value you get for your money, so we’ve added cheap mattresses that get the job done, but also more expensive models with a completely justifiable price tag, so here it goes!

1. Bear

SPECS:

  • Available sizes: Twin, Twin XL, Full, Queen, King, Cal King
  • Mattress height: 10 inches
  • Construction: 2″ Gel-infused Graphite Memory Foam + 2″ Transitional Polyfoam + 6″ HD Polyfoam

Label: best for back pain

The Bear mattress sports a rather unique construction, with features that we have to review so that you can understand why this is one of the best foam mattresses on the market. First of all, the cover is made from a blend of Celliant and polyester, and it’s not the polyester that got us interested in it. Celliant is a fabric designed to absorb your body’s heat, turn it into infrared energy, and then send it back to your body to aid in recovery. That’s why the Bear mattress is believed to be one of the best mattresses for athletes, but also a contender for the title of “best mattress for back pain”.

The comfort layer of the mattress is made from two inches of graphite-infused memory foam, which maintains the temperature neutrality that we’d all like to see in memory foam beds. The transitional layer is made from two inches of polyfoam, while the support layer is made from a 6-inch block of high-density polyfoam. With 10 inches in thickness, this mattress tends to be rather firm, making it a suitable choice for average-weight back sleepers and heavy-weight side and black sleepers.

ProsCons
  • Excellent motion isolation.
  • Good for back pain.
  • Aids in faster recovery.
  • Good pressure relief.
  • Good price.
  • Poor edge support.
  • Slight off-gassing.

Who Should Buy This?

The Bear mattress is a great purchase for value seekers that are looking to invest in a quality foam mattress. It’s ideal for couples that share a bed, for athletes or those who suffer from acute or chronic back pain induces by injury or accidents.

CHECK PRICE

2. Leesa Original

SPECS:

  • Available sizes: Twin, Twin XL, Full, Queen, King, Cal King
  • Mattress height: 11 inches
  • Construction: 2″ 3 PCF HD Polyfoam + 2″ 3 PCF low-density Memory Foam + 6″ 3 PCF Polyfoam

Label: best for average-weight sleepers

The Leesa mattress has a construction that makes it a perfect choice for lightweight sleepers that love the feel of foam and could use the conforming benefits that come from sleeping on such a bed. The cover of the mattress is created from a blend that uses Lycra spandex and polyester to create an elastic material that’s heat resistant and pretty breathable. There are two comfort layers in this mattress. The first one is a two-inch layer of high-density polyfoam, while the second layer is a low-density two-inch block of memory foam. The support core of the mattress measures six inches and is constructed out of high-density polyfoam, leading up to a 10-inch mattress.

There are a few things that make the Leesa mattress stand out of the crown, such as the excellent pressure relief it provides, the great motion isolation properties, and the fact that it can support quite a lot of different sleepers. It does have poor edge support and doesn’t excel in durability, at least when compared to higher-end foam mattresses.

ProsCons
  • Great pressure relief.
  • Good price.
  • Minimal noise.
  • Good for back pain.
  • Not responsive enough for frequent position changes.

Who Should Buy This?

If you are a sleeper that weighs between 130 and 230 pounds, the Leesa Original mattress is capable of providing you with a decent amount of support regardless of your favorite sleeping position. It also caters to the needs of lightweight back and stomach sleepers and, at this price, one could also afford it even if they have to stick to a limited mattress budget.

CHECK PRICE

3. Plank

SPECS:

  • Available sizes: Twin, Twin XL, Full, Queen, King, Cal King, Split Cal King, Short Full, Short Queen, Short King, Olympic Queen, three RV King sizes
  • Mattress height: 11.5 inches
  • Construction: 1.5PCF Quilted Polyfoam (50ILD) + .075″ 1.5 PCF Quilted Polyfoam (36 ILD) + 3.5 PCF TitanFlex Polyfoam (30 ILD) + 1.8 PCF HD Polyfoam (36 ILD)

Label: best firm mattress

When it comes to firm all-foam mattresses, few models are firmer than the Plank. The cover is made from a blend of polyester and cotton, but you can additionally purchase a cooling panel created from phase-change molecule fabric. At this point, it’s important to disclose the fact that this is a flippable mattress with one side of the bed being firm and the other being… even firmer. The firm side (which has a firmness rating of 7/10) comes with a 1.5-inch layer of high-density polyfoam. The comfort layer of the ultra-firm side (which has a firmness rating of 9/10) is made with a 0.75-inch layer of polyfoam and another two-inch layer of TitanFlex foam underneath it. The support core of the mattress is a seven-inch block of high-density polyfoam, leading to a mattress with an 11.5-inch profile.

Now, there are few things that we have to mention about this rather unique and very firm construction. First of all, the choice of foam that’s used to make this mattress leads to a product that’s considerably more durable compared to other all-foam mattresses on the market. The high firmness levels also offer above-average edge support compared to what other foam mattresses offer.

ProsCons
  • Flippable construction.
  • Good for stomach sleepers.
  • Above-average edge support.
  • Great durability.
  • RV sizes available.
  • Is considered too firm by many sleepers.

Who Should Buy This?

This firm mattress is a good purchase for sleepers who weigh more than 230 pounds, but also does well for back sleepers since the high firmness level doesn’t allow the hips to sink into the surface of the mattress.

CHECK PRICE

4. Layla

SPECS:

  • Available sizes: Twin, Twin XL, Full, Queen, King, Cal King
  • Mattress height: 10 inches
  • Construction: 3″ 3.5 PCF Copper-infused Memory Foam + 2″ 1.8 PCF Convoluted Polyfoam + 4 1/2″ 2 PCF Polyfoam (36 ILD) + 1″ 3.5 PCF Copper-infused Polyfoam

Label: best flippable mattress

The Layla mattress has been rated by a lot of experts and is considered to be the best flippable all-foam mattress that money can buy. It is made with a polyester blend cover that can be removed and cleaned in your washing machine. This flippable mattress has a medium-soft side (with a firmness rating of 4/10) and a firmer side (that measures 7/10 on the firmness scale). With the softer side up, the mattress has a comfort layer made from three inches of copper-infused foam. The firmer side of the bed is designed with a one-inch layer of foam with the same copper infusion. The transition layer is only available for the medium-soft side, and it’s a two-inch layer of convoluted polyfoam for better breathability. The core of the mattress lies in the 4.5-inch layer of high-density polyfoam.

Because of the materials used in its construction, this is one durable mattress, especially if you sleep mostly on the firmer side. It performs well in a variety of other chapters, such as pressure relief and motion isolation, and also has less off-gassing compared to other all-foam beds. The 10-inch flippable Layla mattress doesn’t support stomach sleeping regardless of your weight, but it does provide a lot of back and side sleeping support if you are an average-weight sleeper.

ProsCons
  • Great durability.
  • Excellent motion isolation.
  • Minimal off-gassing.
  • Two firmness levels.
  • Good pressure relief.
  • Poor edge support.
  • Firm side is still too soft for heavyweight sleepers.

Who Should Buy This?

The Layla mattress is the perfect purchase for people who want an all-foam flippable mattress because they love the contouring sensation that only foam can provide. It is also a worthy purchase for sleepers that want to have multiple firmness options in a single mattress.

CHECK PRICE

5. Loom & Leaf

SPECS:

  • Available sizes: Twin, Twin XL, Full, Queen, King, Cal King, Split King, Split Cal King
  • Mattress height: 12 inches
  • Construction: 2″ 4 PCF convoluted gel memory foam + 2.5” 5 PCF memory foam + 2” 1.6 PCF polyfoam + 5.5” 1.8 PCF polyfoam

Label: best for combination sleepers

Made by Saatva, the Loom & Leaf mattress sports an all-foam construction that measures 12 inches in height and is available in two firmness options: the Relaxed Firm variant (with a 5.5/10 firmness rating) and the Firm option (8/10 firmness rating). The mattress debuts with an organic cotton cover that feels pleasant to the touch, but is also highly breathable. Regardless of the firmness option chosen, you will get a mattress with a comfort layer that’s made from two inches of convoluted memory foam plus another 2.5-inch layer of 5 PCF memory foam. The support core is made from two inches of 1.6 PCF polyfoam and another 5.5-inch later of 1.8 PCF high-density polyfoam.

What you can expect to get is a mattress that performs well in chapters such as motion isolation, pressure relief, and durability, but it surely lacks temperature neutrality (despite its use of convoluted foam to maximize airflow) and edge support. It is, however, a mattress that is perfectly constructed to balance the amount and comfort and support for sleepers of all weight and regardless of their favorite sleeping positions, making this mattress a great option for those of you that like to switch between sleeping positions at night.

ProsCons
  • Excellent motion isolation.
  • Great pressure point relief.
  • Above-average durability.
  • Good for all sleeping positions.
  • Two firmness choices.
  • Sleeps hot.
  • Poor edge support.

Who Should Buy This?

Because it provides great support for sleepers of all weight and who prefer any of the three main sleeping positions, the Loom & Leaf mattress is great for people who combine sleeping positions throughout the night.

CHECK PRICE

Bottom Line

Choosing a foam mattress is more complicated than it appears to be, even if this category comes with some of the most affordable mattresses on the market. It’s important for you to know about foam density, how it affects the different aspects of a mattress, and what your body needs to get a good night’s rest every time. With all this newly-acquired information, you can objectively analyze how a mattress performs and if it poses a purchase worthy of your money.