by Mira Rakicevic

The Best King Size Mattress of 2020
(Expert Guide & Reviews)

To help you find the best king size mattress, our team of expert reviewers analyzed 22 hybrid mattresses, 19 foam beds, and 7 innerspring mattresses. After thoroughly examining their features, we compiled a list of the top 10 based on the most important criteria:

  • Comfort level
  • Quality
  • Trial period and return policy
  • Warranty
  • Price

You can read more about our methodology below.

We also prepared a simple yet comprehensive guide to assist you in the shopping process. Here, you can find all the things you need to consider before you set your mind on any particular mattress.

The Top 10 King Size Mattresses

Great pressure relief
Zoned support
Excellent at isolating motion
FROM $1,195
Excellent pressure relief
Exceptional at isolating motion
Several firmness levels
FROM $411
High level of personalization
Luxurious mattress at a reasonable price
Great temperature regulation
FROM $1,499
Excellent temperature regulation
Three firmness levels
Internal split option
FROM $1,599
A wide choice of mattresses
Excellent temperature regulation
Strong edge support
FROM $1,245
Excellent at isolating motion
Deep body contouring
Below average price tag
FROM $999
Good spinal support
Excellent at isolating motion
Doesn’t sink too much
FROM $1,195
Excellent at isolating motion
Great contouring
Minimal sinkage
FROM $949
Excellent spinal support
Good pressure relief
FROM $750
Great contouring
Good temperature regulation
Great motion isolation
FROM $550

King Size Mattress Reviews

1. Casper King Size Mattress Review

Best King Size Mattress - Casper

Rating: 9.6

  • Type: Foam/hybrid
  • 100-night trial
  • 10-year warranty
  • Free shipping
  • Price: $1,195

Casper is one of the most renowned mattress brands in the industry. It offers three all-foam models—the Essential, the Casper, and the Wave. However, it has recently added a hybrid option for two of its models.

The Casper probably sells the most since it offers great comfort for a reasonable price. In its original version, it consists of four layers designed to keep the body in perfect alignment without adding additional pressure to sensitive points, such as the hips and shoulders. This is why it’s often mentioned among the best mattresses for side sleepers in numerous mattress reviews, although back and stomach sleepers won’t be disappointed either. Its versatility is just one of the factors which make it our top choice overall.

In fact, it boasts a Zoned Support foam that provides exceptional support to your back, while allowing pressure relief for your hips and shoulders. Many customers praise this feature since it relieves their aches and pains, and helps them have a great night’s rest.

Another big plus is that the Casper has excellent motion transfer, which makes it perfect for couples. However, if you’re on the heavier side, we’d recommend opting for a hybrid version because coils offer stronger support. Casper also offers king size bedding that will perfectly fit your mattress. Learn more about the Casper mattresses by reading our full review.


  • Great pressure relief
  • Zoned support
  • Excellent at isolating motion


  • Lacks bounce

2. Zinus King Size Mattress Review

Best King Size Mattress - Zinus

Rating: 9.4

  • Type: Memory foam
  • 100-night trial
  • 10-year warranty
  • Free shipping
  • Price: $411

Looking for the best affordable king size mattress? If that’s the case, you have to check out what Zinus has to offer! This mattress brand has designed four memory foam mattresses and six hybrid mattresses. In addition, each mattress model comes in several thicknesses that provide different levels of firmness and sinkage. Therefore, anyone should be able to find the perfect mattress for a good night’s sleep.

The Zinus 12″ Pressure Relief Memory Foam Cloud Mattress is comprised of four layers that all contribute to its amazing comfort. The manufacturer claims that it offers a cloud-like feeling, and we have to admit that this might be the best king mattress for anyone looking for great pressure relief. Thanks to the combination of the Viscolatex responsive foam and memory foam, it truly provides an exceptional cushioning feel.

Since this is an all-foam model—these models are generally famous for their great ability to absorb motion—this king size memory foam mattress is an excellent choice for couples. Once again, we’ll have to emphasize that the Zinus king size mattress is perfect for people on a budget since its price tag is below the average price point.


  • Excellent pressure relief
  • Exceptional at isolating motion
  • Affordable


  • Weaker edge support

3. Saatva King Size Mattress Review

Best King Size Mattress - Saatva

Rating: 9.2

  • Type: Innerspring
  • 120-night trial
  • 15-year warranty
  • Free shipping
  • Price: $1,499

Saatva is another company well-known for its luxurious mattresses. Thanks to its quality and reasonable pricing, the Saatva Classic mattress has become very popular in the mattress-in-a-box world. Thus, it has easily earned a place on just about any list of the top 10 most comfortable mattresses.

This innerspring model consists of three layers: two different types of coils separated by foam and a Euro pillow top. Its “coil-on-coil” technology makes the mattress extremely supportive, so it will keep your spine in proper alignment no matter your sleeping position.

This luxurious pillow top mattress comes in three firmness levels and two thickness options, which you can choose between depending on your sleeping position and any other sleeping preferences. It’s amazing that you can personalize your mattress at no additional cost. With this in mind, we can say that Saatva offers the best prices for king size mattresses in the luxury category.

While the Saatva mattress excels at temperature regulation, it isn’t that good at isolating motion. We’d say this is somewhat expected since innerspring mattresses are bouncier than foam mattresses. While we wouldn’t recommend this mattress to light sleepers, it’s a great choice for those whose main priority is a healthy sex life.


  • High level of personalization
  • Luxurious mattress at a reasonable price
  • Great temperature regulation


  • Average motion isolation

4. Nest Alexander Hybrid King Size Mattress Review

Best King Size Mattress - Nest Bedding

Rating: 8.9

  • Type: Hybrid
  • 100-night trial
  • Lifetime warranty
  • Free shipping
  • Price: $1,599

Nest Bedding is a well-established mattress-in-a-box company that was founded in 2011. It has been doing well on the market for a while now, and for good reason. It offers a wide range of mattresses, all of which are made of high-quality materials.

The Alexander Signature Hybrid is one of the top-rated mattresses in 2020, and we would definitely recommend it in its king size. It’s made of five layers, which are all there to make you comfortable and help you have the best night’s sleep.

The combination of coils and foam layers has a number of benefits. While innerspring mattresses don’t perform so well when it comes to motion transfer, this hybrid mattress absorbs motion pretty well thanks to three foam layers that are placed on top of pocketed coils. Therefore, both you and your partner can enjoy undisturbed sleep even if one of you tends to sleep restlessly. This is also emphasized in many of the best king size mattresses’ reviews out there.

In addition, the Alexander Signature Hybrid mattress has great temperature regulation, for two reasons. First, the coils improve the airflow, and second, the foam layers are infused with copper and a cooling gel. You can also buy a king size mattress topper that offers additional cooling features.

This great king size bed comes in three firmness levels, so you can choose the one you like most. What’s more, Nest Bedding offers an internal split option, which is the best option for couples whose preferences differ greatly.

And don’t forget that Nest Bedding’s mattresses come with a lifetime warranty.


  • Excellent temperature regulation
  • Three firmness levels
  • Internal split option


  • Heavy and difficult to move

5. Helix King Size Mattress Review

Best King Size Mattress - Helix

Rating: 8.8

  • Type: Hybrid
  • 100-night trial
  • 10-year warranty
  • Free shipping
  • Price: $1,245–$2,145

Helix specializes in hybrid mattresses, and we have to admit that the company really stands out from the competition thanks to its wide choice. Among its amazing selection, there are six core models, plus three special models. In addition, each of the core models has its luxe counterpart.

This may seem confusing, but fortunately, Helix has come up with a simple quiz that will help you find the best mattress in a box for you depending on your sleeping preferences. If you’ve decided to splurge on your king-sized bed, you can opt for a luxe version, which has two additional layers.

If you’re plus-sized and need extra support, Helix has specially designed a mattress for big and tall. The other two special models are meant for couples with different sleeping preferences. So if you and your partner can’t find common ground, simply buy a split king mattress.

While not the best cheap king size mattress, we can say that the Helix mattress’s pricing is quite reasonable considering the quality of the materials. Even more importantly, the mattresses are all built to last. You can also add the company’s amazing sheets, which are made of Tencel, and king size pillows to boost your sleeping experience.


  • A wide choice of mattresses
  • Excellent temperature regulation
  • Strong edge support


  • Heavy and difficult to move

6. Nectar King Size Mattress Review

Best King Size Mattress - Nectar Sleep

Rating: 8.7

  • Type: Memory foam
  • 365-night trial
  • Forever warranty
  • Free shipping
  • Price: $999

This young company, which was founded only a couple years ago, has quickly become established in the competitive mattress-in-a-box industry. If you’re a memory foam fan who prefers mattresses with a deeper hug, the Nectar is the right choice for you.

Although it offers only one mattress model, it has received a heap of positive reviews, and lots of them claim it’s the best king size mattress for back pain. This is because the mattress provides great support and some nice cushioning at the same time. We’d recommend it to back and side sleepers, while stomach sleepers typically need less sinkage.

Since the Nectar uses a Tencel cover and gel memory foam in its first layer, it sleeps cooler than most foam mattresses, according to numerous king size mattress reviews from customers. Couples will also be happy to hear that this king size mattress absorbs motion very well.

Considering that the manufacturer offers an entire year to test your mattress, there’s really no risk in giving it a try. What’s more, the Nectar comes with a lifetime warranty, which should give you peace of mind if you decide to buy it.


  • Excellent at isolating motion
  • Deep body contouring
  • Below average price tag


  • Too much sinkage for some sleepers

7. Leesa King Size Mattress Review

Best King Size Mattress - Leesa

Rating: 8.6

  • Type: Foam
  • 100-night trial
  • 10-year warranty
  • Free shipping
  • Price: $1,195

The Leesa mattress is made of three types of foam, which are designed to support and align the body in all sleeping positions. Thanks to its LSA200 foam and memory foam, this mattress is very comfortable, especially for stomach and back sleepers, so it definitely deserves to be among the best king size beds. However, even though these two premium top layers allow for pressure relief, some side sleepers find the mattress a bit on the firm side.

The great news is that the Leesa mattress minimizes motion transfer, so couples can sleep peacefully without worrying that they’ll wake each other up if they tend to change their sleeping positions. It’s also quite breathable, especially for an all-foam mattress, which has been mentioned in more than one king size mattress review.

Besides using quality materials and offering great comfort, Leesa is special for other reasons as well. This mattress company donates a mattress to a shelter for every ten it sells. It also plants a tree whenever it sells a mattress. It’s amazing to participate in their honorable goals.

Although it’s a bit pricier than other mattresses on the list, it definitely offers great value for money. You can also check out Leesa’s choice of mattress bases, including their king size platform bed, which is a new option. To find out more about Leesa models, check out our in-depth review.


  • Good spinal support
  • Excellent at isolating motion
  • Doesn’t sink too much


  • Too firm for some sleepers

8. Live and Sleep King Size Mattress Review

Best King Size Mattress - Live and Sleep

Rating: 8.4

  • Type: Memory foam
  • 100-night trial
  • 20-year warranty
  • Free shipping
  • Price: $949

Live and Sleep offers three all-foam mattresses. Although each has its advantages, we believe that the Luxury Mattress is Live and Sleep’s best because it suits so many sleepers. It’s medium-firm, so most customers are satisfied with the feel it offers. Under its soft breathable cover, the mattress consists of three foam layers, which all work together to provide exceptional comfort.

On top of that, there’s minimal sinkage, possibly making it the best king size memory foam mattress for all sleeping positions. Thanks to its great support, the mattress will keep your body in perfect alignment, while its top memory foam layer contours to your body shape and provides pleasant pressure relief. It’s also great that it absorbs motion pretty well, so couples are able to have a great night’s sleep even if one of them is a restless sleeper.

Although Live and Sleep’s Luxury Mattress isn’t a cheap mattress, it is one of the few affordable king size mattresses that can boast such a luxurious look and feel. If you’re still having doubts, keep in mind that this manufacturer offers a 100-night trial during which you can test the mattress out and return it if you’re not satisfied. In addition, the mattress is covered by a 20-year warranty, which isn’t a small thing.


  • Excellent at isolating motion
  • Great contouring
  • Minimal sinkage


  • Not ideal temperature regulation

9. Tuft & Needle King Size Mattress Review

Best King Size Mattress - Tuft & Needle

Rating: 8.3

  • Type: Foam
  • 100-night trial
  • 10-year warranty
  • Free shipping
  • Price: $750

Tuft & Needle focussed on a simple design and reasonable pricing. That’s probably why they have quickly become so popular. T&N’s original mattress might be what you need if you want to get the best king size mattress under $1000.

Even though it has only two layers, this all-foam mattress is very comfortable. It’s made of Tuft & Needle adaptive foam, which at the same time provides cushioning and bounce. Therefore, while it will be soft on your pressure points, you won’t feel stuck in the mattress. However, some customers complain that it’s too firm. Although this is a subjective feeling, this might not be the best king size mattress for side sleepers. Instead, we’d recommend this mattress to back and stomach sleepers who need more solid support.

Another cool feature is that its proprietary foam is infused with a heat wicking graphite and cooling gel, so its temperature regulation is above-average when compared to other foam mattresses. Finally, this king size mattress is made for couples since it has great motion isolation. So you don’t have to worry that your partner will wake you, even if they toss and turn all night.

If you’re looking for the best king size memory foam mattress topper, Tuft & Needle’s topper is a pretty good option since it’s very cushy even though it’s actually made of polyurethane foam. To complement your king size mattress, Tuft & Needle also offers quality bedding, from king size sheets to king size duvet covers.


  • Excellent spinal support
  • Breathable
  • Affordable


  • Too firm for some sleepers

10. Nuvanna King Size Mattress Review

Best King Size Mattress - Nuvanna

Rating: 8.2

  • Type: Foam
  • 100-night trial
  • 10-year warranty
  • Free shipping
  • Price: $550–$950

Nuvanna is still rather new in the mattress-in-a-box market. Nevertheless, it offers an amazing mattress at a very affordable price. It’s an all-foam mattress, which has a medium-firm feel. As you will see below, people often choose different firmnesses depending on their preferred sleeping position. While stomach sleepers might be looking for the best firm king size mattress, this all-foam mattress will suit most side and back sleepers.

The Nuvanna mattress is comprised of three layers that are designed to provide maximum comfort. The high-density polyfoam in the base layer provides great support, while the memory foam and gel-infused polyfoam in the comfort layer allow for some nice pressure relief. The mattress is topped with a Tencel cover, which is very soft and breathable. Some of the top rated mattresses for 2020 use this type of material.

Even though the construction of the mattress is made of different types of foam, the bed has a pretty good temperature regulation. Also, if you or your partner is a light sleeper, you should know that this king size mattress might be a great pick because it isolates motion very well.

The good news is you can test this mattress at home for more than three months and then decide if you like it or not. Even better, it comes with a 10-year warranty.


  • Great contouring
  • Good temperature regulation
  • Great motion isolation


  • Only one firmness level

How We Chose the Best King Size Mattress

Our Ranking Methodology

This isn’t just a random list of top-rated king size mattresses. We’ve actually put in a lot of effort to develop a reliable ranking methodology. For each mattress we analyzed, we followed the same procedure in order to get an objective score. Here’s the list of features we evaluated.

Comfort Level

Of course, the most important feature of any mattress is its comfort level since its main purpose is to allow you to have a good night’s sleep. And you can’t rest properly if your bed isn’t comfortable. However, it’s really challenging to find the best mattresses according to the level of comfort they provide because this is usually a pretty subjective feel.

While some people prefer very firm mattresses, others find them extremely uncomfortable since they put additional pressure on their joints, like their shoulders or hips. On the other hand, soft mattresses can offer pleasant cushioning around your pressure points. Still, for some sleepers, a soft mattress can mean waking up with back pain. As you’ll see below, choosing the best mattress in the king size category will mostly depend on your preferred sleeping position.

However, regardless of its firmness level, a solid mattress needs to provide adequate support to the body and keep the spine in perfect alignment. That’s why we focused on each mattress’s quality when assessing different mattress brands.


When buying a new mattress, high quality should definitely be one of your top priorities. If you settle for one made of low-quality materials or with poor construction, you’ll quickly end up with an uncomfortable mattress. To avoid waking up with aches and pains, you need to find a mattress that will support you in the years to come. After all, a king size mattress is not a small investment, so you need to find the best king size mattress for the money you want to spend.

That’s why we paid special attention to the materials used, the type of construction, and the number of layers. Generally, coil and hybrid mattresses tend to be more durable than foam mattresses since they don’t sag quickly. However, there’s a range of different foams, all of varying qualities and densities. High-density foam will typically provide solid support to both the mattress’s top layers and your body.

Besides breaking down the mattress’s construction, we also went through hundreds of the best king size mattress reviews left by customers to learn as much as possible about each mattress’s longevity.

Trial Period and Return Policy

Buying a mattress online usually comes with a great perk—a trial period. Most reputable mattress brands offer a period during which you’re able to try your mattress at home and decide if it’s right for you. This is your safety cushion. If the mattress doesn’t meet your expectations, you can return it to the manufacturer at little to no cost.

When we ranked king size mattresses, we took into account whether the companies offer a trial period, how long it lasts, and how simple their return procedure is.

We don’t recommend buying a mattress without testing it, not even the best-rated king size mattress. So this feature greatly affected our final score. When you know that there’s a money-back guarantee, there won’t be additional pressure for you while weighing all the pros and cons.


Checking if the manufacturer offers a warranty and what it covers is another important thing to do. Most mattresses come with a 10-year warranty regardless of their price, but it’s always recommended to carefully read the fine print to know what kind of damage is covered and under which conditions.


What is a good price for a king size mattress? King size mattress prices range from several hundred to several thousand dollars. While your choice will depend on your budget, we tried to assess what you’ll get for your money. Handing over a small fortune on a mattress doesn’t guarantee that you’ll get the best product. Therefore, we give our all to find the mattresses that offer good value for the money.

What to Keep in Mind When Shopping for a King Size Mattress

Buyer’s Guide

Looking for the best online mattress for your king size bed frame? A king size mattress is a great option for anyone who has a spacious bedroom. Here’s what you need to know if you’ve decided to upgrade your shut-eye.

The Benefits of a King Size Mattress

Many couples, especially those who like to cuddle throughout the night, choose a queen size mattress for themselves. While a queen mattress is 60″ wide and 80″ long, a king mattress is wider—by 16″, to be precise.

So its greatest advantage is pretty obvious—you’ll have more space to stretch out and enjoy your night’s rest. It’s great that there are so many inexpensive king size mattresses, so you don’t need to splurge on this amazing upgrade.

No matter if you sleep alone or with a partner, this extra sleeping area makes the bed more comfortable. Also, if you have a kid or a furry friend who likes to sneak into your bed, you’ll definitely appreciate the additional room you’ll get with a king size mattress.

Another benefit that comes with a king size is a sense of luxury, especially if you get a mattress with a thicker profile or you find the best king size pillow top mattress. This is the simplest way to add some luxury to your bedroom and make it feel like you’re in a 5-star hotel.

A King vs. California King Mattress

Both king and California king mattresses are larger than queens. While their total surface area is almost the same, they have different dimensions.

The king mattress dimensions are 76″ x 80″. That’s why it’s perfect for couples or even parents who sleep with their child in the same bed. So if you keep waking up on the edge of your mattress, you should invest in the best king size bed and mattress for your needs.

A California king is 72″ x 84″. This means that it is 4″ longer than both king and queen size mattresses. When it comes to its width, it’s somewhere between a king and queen size. This makes it perfect for taller people who need extra space for their legs.

A Split King Mattress

Some people decide to place two smaller mattresses next to each other on the same base to get a split king. Read on to find out if this might be the best king size bed for you.

You might choose to put two twin mattresses together to get the width of a king size mattress, since a twin size mattress is 38″ x 75″. However, you’ll end up with a slightly shorter bed. If you want to get the exact king mattress size, you’ll have to put two twin XL mattresses together, since a twin XL is 38″ x 80″.

But why would you want to do this? Maybe you and your partner don’t have the same sleeping preferences and can’t agree on the same firmness level. This way, each of you gets a chance to choose how firm your side of the bed will be. In some cases, this is a way to get the best price for a king size mattress.

Besides allowing you and your partner to enjoy a unique level of comfort while in bed, a split king mattress is also the perfect solution for a king size adjustable bed. With this kind of mattress, each of you can set up the base in your preferred position.

How to Choose the Best King Size Mattress for You

Before you start browsing through different brands and mattress types, think of your preferred sleeping position as well as your other preferences. For example, are you a hot sleeper? Or do you often wake up with aches and pains? Before you start looking for the best deal on a king size mattress, consider the following, since this will help you find the perfect king size mattress for your needs.

1. Sleeping Position

Regardless of your preferred sleeping position, your mattress needs to keep your spine in perfect alignment.

  • Back sleepers need a mattress that offers ample support to their shoulders, trunk, and hips. That’s why they usually benefit most from medium to firm mattresses that don’t allow for much sinkage.
  • Side sleepers usually prefer a softer bed that provides pressure relief for their shoulders and hips. They enjoy the deeper hug that most foam mattresses offer. They can also consider looking for the best king size mattress topper for their needs if their mattress is too firm.
  • Stomach sleepers, like back sleepers, also need solid support for their hips since otherwise their spine may be in an unnatural position, causing them to wake up with back pain. That’s why they should look for firmer mattresses.
  • Combo sleepers need to pay attention to the sinkage level of a mattress since they don’t want to feel stuck when changing positions during the night. That’s why a puffy mattress usually isn’t the best option for them.

2. Sleeping Preferences

  • People who suffer from back pain tend to like medium-firm mattresses. Also, memory foam mattresses are usually the best mattresses for back pain since they contour around the body, not leaving any gaps.
  • Heavy people generally need an innerspring or hybrid mattress since coils provide ample support.
  • Couples need to pay special attention to edge support. If a mattress doesn’t provide adequate support at its edges, sleepers might feel like they’ll fall off the bed. However, since king size mattresses have a large sleeping area, this shouldn’t be an issue. In addition, the best king size mattress in 2020 will absorb motion effectively. This is another important feature for couples, especially if one or both of them are light sleepers.
  • Hot sleepers who tend to wake up sweaty should stay away from foam mattresses. These typically retain more body heat and don’t have good airflow.
  • Sleepers who suffer from allergies should look for mattresses made of memory foam or latex (if they’re not allergic to it, obviously).


How do I pick the best mattress?

Every person is different, and every sleeper’s needs are different, too. Therefore, in order to find the best mattress for you, think of your preferred sleeping position and sleeping preferences. For example, if you tend to wake up sweaty, it’s best to look for innerspring or hybrid mattresses, which are generally more breathable than foam mattresses. Also, never buy a mattress without testing it, either in a store or, even better, at home. Most online mattress brands offer a risk-free period during which you can sleep on a new mattress and decide if it’s right for you.

Which mattress is best for back pain?

Most sleepers with back pain recommend latex and memory foam mattresses. Hybrid mattresses are also a good choice because their coil system provides zoned support, while the top layer offers pressure relief.

Generally, which mattress will suit you best will depend on your body weight and sleep preferences. Just keep in mind that the bed needs to provide ample support and keep your spine in perfect alignment, while conforming to your body.

How wide is a king size bed?

A king size bed is 76″ wide and 80″ long. This means it’s 16″ wider than a queen mattress and 23″ wider than a full size mattress. However, always check the dimensions of a mattress before buying it since some manufacturers produce mattresses in non-standard sizes.

What size is a California king?

A California king mattress is 72″ wide and 84″ long. So it’s 4″ narrower than a king size mattress, but 4″ longer. In fact, it’s the longest mattress and therefore best suited to very tall people.

How big is a king size blanket?

Blanket sizes are not standardized the same way mattresses are. However, a king size blanket is generally 108″ wide and 90″ to 100″ long.

How much does a king size mattress cost?

The prices of king size mattresses greatly vary depending on the brand, type, and materials used. They range from a few hundred to a few thousand dollars. Therefore, regardless of your budget, you can find a quality king size mattress.

What is the best month to buy a mattress?

The time of the year may actually affect the price of a mattress. Typically, most retailers offer discounts between February and May because they are making room for new models, which usually arrive in June.

In addition, weekends around national holidays are a great time to go shopping for a mattress. President’s Day, Memorial Day, Fourth of July, Labor Day, and Black Friday are all great occasions to buy a new mattress since that’s when you’ll probably get the best deal.

What size washer do I need for a king size comforter?

A king size comforter can fit in a machine whose capacity is at least 3.8 cubic feet. However, always check the comforter’s label before machine-washing it because some delicate materials need to be hand washed.

Wrapping Up

Hopefully, our list of the top 10 mattresses as well our detailed guide on buying a mattress will be of great help to you. As you can see, there are a number of things you need to consider in order to find the best king size mattress for you. But we hope that with our guidance, your choice will be much easier!

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