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Best King Size Mattresses – 2020 Reviews and Buyer’s Guide

Written by Keith Cushner

Our Research

157
Mattresses Considered
3,000
Hours of Research
10
Mattress Executives Interviewed
8
Sleep Experts Consulted

Quick Overview

With mattresses, sometimes bigger is better. King size mattresses — including variants like California king — are the largest standard sizes on the market. They offer plenty of room for couples, taller sleepers, families, pet owners, and even just people who like to sprawl in bed. However, with a wide range of material choices, price-points, and luxury features to choose from, finding the best king size mattress can be a struggle. To help our readers achieve a good night’s sleep, we’ve put together a list of our favorite king size mattresses on the market.

Best King Size Mattresses

Almost every major mattress brand is available in a king size option, meaning that customers have a wide range to choose from. Choosing a type of mattress — such as hybrid, memory foam, innerspring, or latex — is the most crucial step, as a mattress’s materials and build make the most significant difference to their overall feel.

First Time Buying a King Size Mattress?

Hop down to our Buyer’s Guide for a crash course on finding the best mattress for you.

King Size Mattress Reviews – Our Top 5 Picks

Editor's Pick
Brooklyn Bedding Signature
Brooklyn Bedding Signature
  • Multiple firmness options (3.5, 5.5, 7.5)
  • 120-night sleep trial and 10-year warranty
  • Available in standard king and California king sizes
  • Hybrid construction
  • Gel-infused polyfoam hugs curves and sleeps cool
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Best Hybrid Mattress
Casper Hybrid
Casper Hybrid
  • Medium (5.5) firmness
  • 100-night sleep trial and 10-year warranty
  • Available in standard king and California king sizes
  • 3 inches of ultra-conforming comfort layering
  • Excellent airflow for a cooler sleep
Check Best Price Jump To Section
Best Memory Foam Mattress
Nectar
Nectar
  • Medium-firm (6)
  • 365-night sleep trial and lifetime warranty
  • Available in standard and California king sizes
  • Lower-than-average price
  • Supportive and comfortable for most sleepers
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Best Latex Mattress
Zenhaven
Zenhaven
  • Flippable, medium-soft (4) and firm (7) sides
  • 120-night sleep trial and 20-year warranty
  • Available in standard, split, and California king sizes
  • Natural materials, including responsive Talalay latex
  • Highly durable with quality construction
Check Best Price Jump To Section
Best Cooling Mattress
Saatva
Saatva
  • Medium-soft (4), medium-firm (6), and firm (7.5)
  • 120-night sleep trial and 15-year warranty
  • Standard, split, California, and split California king sizes
  • Eco-friendly coil-on-coil innerspring construction
  • Free White Glove delivery
Check Best Price Jump To Section

The Best King Size Mattresses - Reviewed

Editor's Pick – Brooklyn Bedding Signature

Editor's Pick – Brooklyn Bedding Signature

Highlights

  • Multiple firmness options (3.5, 5.5, 7.5)
  • 120-night sleep trial and 10-year warranty
  • Available in standard king and California king sizes
  • Hybrid construction
  • Gel-infused polyfoam hugs curves and sleeps cool
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Editor’s Pick Overview

For our Editor’s Pick, we chose the Brooklyn Bedding Signature mattress. We’ve put the Signature through rigorous testing, and it emerged as one of the top-rated mattresses on Tuck, with high-quality hybrid construction at an affordable price-point.

Beneath a quilted polyfoam cover, the Signature’s comfort system is constructed from two 2-inch layers of cooling gel-infused polyfoam, and the support core features 6 inches of pocketed coils and 1 inch of high-density polyfoam.

Though this construction remains consistent, the Signature’s feel varies significantly depending on its firmness level. For customers who choose the right option for their weight and sleep preferences, this customization allows for an ideal blend of pressure relief and support. The soft option, for example, offers a plush, deeply contouring mattress for lightweight sleepers, while the medium and firm firmness levels balance this against — or partially exchange it for —significantly firmer support with minimal sinkage.

Premium materials and top-of-the-line construction allowed the Signature to shine in our testing process, and it earned four stars in all but one of our sleep categories. Couples will particularly appreciate the mattress’s above-average motion isolation, edge support, and suitability for sex, but the Signature is an appealing choice for almost all customers in search of the best king size bed.

The Bottom Line.

With three firmness options and top-of-the-line hybrid construction, the Brooklyn Bedding Signature mattress offers customized support for a wide variety of sleepers. The Signature is one of the top-rated mattresses on Tuck, with an affordable price-point which also makes it one of the best deals available on a king size bed.

  • Almost all sleepers, regardless of weight or sleep position preference. Given the choice of firmness options and the Signature’s impressive performance in our testing, it’s no surprise that nearly all sleepers can find a version of the mattress which suits them well.
  • Couples. King size beds offer plenty of room for couples, and the Signature’s high ratings for motion isolation, edge support, noise, and suitability for sex make it an attractive option.
  • Shoppers on a budget. Although priced higher than many all-foam models, the Signature has below-average pricing for a hybrid mattress.
  • Hot sleepers. Gel comfort layers and airflow through the pocketed coils still allow for very good temperature regulation.

Not Recommended for...

  • Stomach sleepers over 130 pounds. During our testing, our sleepers in this category enjoyed the Signature but found it offered them less support than it offered testers of other weights or position preferences

Best Hybrid Mattress – Casper Hybrid

Best Hybrid Mattress – Casper Hybrid

Highlights

  • Medium (5.5) firmness
  • 100-night sleep trial and 10-year warranty
  • Available in standard king and California king sizes
  • 3 inches of ultra-conforming comfort layering
  • Excellent airflow for a cooler sleep
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Best Hybrid Mattress Overview

Hybrid mattresses are a popular choice, and the best combine the benefits of both all-foam and innerspring beds. The Casper Hybrid offers customers the excellent pressure relief and motion isolation of memory foam, paired with supportive coils which also allow for surprisingly good airflow and temperature neutrality.

The secret to the Casper Hybrid’s responsive pressure relief lies in its three inches of comfort layering. The first 1.5-inch layer is standard polyfoam, a less-conforming material with a much bouncier feel than memory foam. The second 1.5-inch layer is low-to-medium density memory foam, which compresses easily and without bounce but also provides highly-conforming pressure relief. These layers work together to give sleepers a mattress which minimizes pressure points while retaining some responsive bounciness.

In addition to the comfort layering, the Casper Hybrid has a 1.5-inch polyfoam transitional layer, as well as a support core of 6-inch pocketed coils and their 1.5-inch base of high-density polyfoam.

Due to its single firmness rating of medium, or 5.5 out of 10, the Casper Hybrid is more suitable for lightweight and average weight sleepers. Our testers who weigh above 230 pounds, as well as our average weight stomach-sleeping testers, reported that it was too soft for ideal support.

The Bottom Line.

The Casper Hybrid is an excellent choice for customers looking for a mattress that balances the pressure relief of memory foam with the support of pocketed coils. For sleepers under 230 pounds, its careful design provides a bed with both proper support and plush pressure relief.

  • Those looking for advanced pressure relief. With some of the best pressure relief we’ve seen in its class, the Casper Hybrid is an appealing pick for sleepers concerned about pressure points.
  • Sleepers who want a balance of conforming and responsiveness. Due to its use of polyfoam, as well as its pocketed coils, the Casper Hybrid offers pressure relief with more bounciness and responsiveness than an all-foam model.
  • Couples. Hybrids tend to be popular with couples, since they offer better edge support and are more suitable for sex than all-foam mattresses, as well as having improved motion isolation and noise when compared to traditional innersprings.
  • People transitioning from all-foam to hybrid. Sleepers who previously preferred all-foam models are likely to appreciate the Casper Hybrid’s truly balanced feel.

Not Recommended for...

  • Sleepers above 230 pounds. Heavier sleepers tend to prefer firmer mattresses, and our testers in this category reported that the Casper Hybrid failed to offer them adequate support.
  • People who prefer to feel as though they’re sleeping ‘on’ their mattress. The Casper Hybrid balances pressure relief with responsiveness, which gave our testers the feeling of sleeping both ‘on’ and ‘in’ their mattress. However, this may not satisfy those who appreciate a more ‘floating’ sensation with less conforming.

Best Memory Foam Mattress – Nectar

Best Memory Foam Mattress – Nectar

Highlights

  • Medium-firm (6)
  • 365-night sleep trial and lifetime warranty
  • Available in standard and California king sizes
  • Lower-than-average price
  • Supportive and comfortable for most sleepers
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Best Memory Foam Overview

Although memory foam mattresses offer many benefits — a lower average cost, as well as improved pressure relief, noise, and motion isolation — they also have downsides, such as shorter lifespans and worse temperature neutrality. Our choice for the best king size memory foam mattress, however, provides sleepers with all the upsides of memory foam, while minimizing the drawbacks.

A breathable cover, made from Tencel and cotton, allows for cooling airflow. The 4-inch-thick comfort system consists of a 1-inch layer of quilted gel memory foam, as well as a 3-inch layer of gel memory foam. Gel-infused foam is designed to provide more airflow than traditional memory foam. Although both layers are low-to-medium-density, they allow for a mattress which balances luxurious pressure relief with low sinkage and good support.

Following a transitional layer of high-density memory foam, the Nectar has a 5.25-inch support core of high-density polyfoam. While these don’t offer the same durability or edge support as some hybrid, innerspring, or latex mattresses, our testing found that the Nectar performed better in these areas than many of its memory foam competitors.

Where the Nectar really shines is in offering superb pressure relief, motion isolation, and support to a surprisingly wide range of sleepers. Despite only having one firmness level, the Nectar received high grades from sleep-testers of many different weight ranges and position preferences.

The Bottom Line.

The Nectar offers broad appeal and minimal drawbacks while still providing sleepers with excellent pressure relief and motion isolation. With luxury touches and a surprisingly low price given the quality of its construction, the Nectar is an ideal choice for customers looking for a king size memory foam mattress.

  • Sleepers above 130 pounds. Although the Nectar still a good option for lightweight customers, it is most suitable for average weight or heavier sleepers.
  • Value-minded customers. Given its luxury touches, high-quality construction, and low price tag, the Nectar is one of the best deals on the market.
  • Light sleepers. If noisy mattresses have woken you in the past, you’re likely to appreciate the Nectar’s silence and motion isolation.
  • People who sleep warm. The Nectar doesn’t offer the temperature regulation of mattresses without memory foam, but its use of breathable fabrics and gel memory foam make it a cooler option than many of its competitors.

Not Recommended for...

  • Those who prefer sleeping ‘on’ their mattress. The Nectar offers less sinkage than some of its competitors, but still has a distinct body-hugging feel which results in people feeling as though they’re sleeping ‘in’, rather than ‘on’, their bed.
  • Side and stomach sleepers under 130 pounds. While lightweight sleepers reviewed the Nectar reasonably well, it was too firm to to rise above average ratings for lighter side and stomach sleepers.

Best Latex Mattress – Zenhaven

Best Latex Mattress – Zenhaven

Highlights

  • Flippable, medium-soft (4) and firm (7) sides
  • 120-night sleep trial and 20-year warranty
  • Available in standard, split, and California king sizes
  • Natural materials, including responsive Talalay latex
  • Highly durable with quality construction
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Best Latex Overview

In many ways, latex is a natural alternative to memory foam. Sourced from rubber trees, latex offers pressure relief with a bouncy resilience, as compared to memory foam’s signature contouring. Natural latex also sleeps cooler, and is significantly more durable than synthetic foams. The Zenhaven makes the most of these characteristics and offers sleepers — particularly back sleepers and average weight sleepers — one of the best latex mattresses on the market.

The Zenhaven was designed to be eco-friendly, beginning with its organic cotton cover. As a flippable mattress, its comfort system consists of two 1.5-inch layers of aerated Talalay latex, with one on each side. The firm side uses medium-soft latex, while the medium-soft side uses similarly softer latex.

To ensure sleepers receive the ideal support for each area of their body, each side is divided into five zones with pincore hole patterns to ergonomically alter the density. Finally, the support core consists of 6 inches of Talalay latex.

During our testing process, the Zenhaven performed very well in all but a few of our sleep categories. It also received high marks from our sleep-testers, receiving nothing lower than three stars, though back-sleepers were among the most impressed.

The Bottom Line.

The eco-friendly Zenhaven shows off latex’s best side, with cool and responsive pressure relief and ergonomically zoned support. Although the Zenhaven is best suited to side-sleeping or average weight customers, its flippable firmness options and balanced comfort still make it appealing to a wide range of sleepers.

  • Back sleepers of any weight. Although the Zenhaven’s five ergonomic zones work for all positions, they seem best calibrated for back sleepers.
  • Average weight sleepers. Because the Zenhaven is flippable, average weight sleepers of any position preference should be able to find a firmness level which supports them without pressure points.
  • Families. Parents concerned about materials will appreciate the use of organic fibers, and the cool-sleeping latex will help everyone remain comfortable when your child climbs into bed.
  • Eco-conscious customers. Zenhaven’s eco-credentials are in order, with sustainable touches including the use of organic fibers, natural flame retardants and anti-microbial barriers, and Talalay latex.

Not Recommended for...

  • People who need good edge support. Poor edge support is one of the Zenhaven’s few downsides, making it unsuitable for anyone who needs edge support getting into or out of bed, or while sleeping near the edge.
  • Sleepers who prefer a close-contouring mattress. While latex mattresses like the Zenhaven do provide soothing pressure relief, the lack the close contouring of memory foam and cause sleepers to feel as though they are sleeping ‘on’, rather than ‘in, their mattress.

Best Cooling – Saatva

Best Cooling – Saatva

Highlights

  • Medium-soft (4), medium-firm (6), and firm (7.5)
  • 120-night sleep trial and 15-year warranty
  • Standard, split, California, and split California king sizes
  • Eco-friendly coil-on-coil innerspring construction
  • Free White Glove delivery
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Best Cooling Mattress Overview

With luxury touches at an affordable price, the Saatva — which offers four king size variants to choose from, in addition to three firmness options and two thicknesses — is our choice for the coolest king size bed on the market. Traditional innersprings like the Saatva allow for the most airflow, keeping even the warmest sleeper cooler than the other mattresses on our list.

Although the Saatva may not be as all-natural as the Zenhaven (also manufactured by Saatva), it does use sustainable manufacturing where possible. This begins with the cover, which is made of ultra-soft organic cotton and includes a flame retardant barrier made using thistle pulp. All thickness and firmness options include a dacron-fiber pillow-top for a supportive plush surface, as well as a 1-inch polyfoam comfort layer which improves pressure relief.

Beneath the comfort layers is the first of the Saatva’s two coil layers: four inches of medium-gauge pocketed coils for a balanced feel. Following this is four or seven inches of recycled steel Bonnell coils (depending on the mattress thickness chosen), for a coil-on-coil design which offers better support and pressure relief than traditional innersprings.

Due to having three separate areas to customize, as well as offering targeted support with its coil-on-coil construction, the Saatva is likely to appeal to a wide range of sleepers.

The Bottom Line.

Innerspring mattresses sleep cooler than most other mattress types, but the Saatva’s charms extend beyond its superior temperature neutrality. Features like eco-conscious construction, customizable options, and luxury touches are matched by an affordable price, making the Saatva a great deal with broad appeal.

  • People who sleep warm. Thanks to their superior airflow, innersprings are one of the coolest types of beds, and the Saatva offers a pressure-relieving coil-on-coil design to improve on the traditional model.
  • Customers in search of king size variants. With four king size variants to choose from, including the hard-to-find California split king, the Saatva has the highest number of king sizes to choose from on our list.
  • Eco-conscious customers. Although the Saatva uses some synthetic materials, its use of organic cotton, recycled steel coils, and botanical anti-bacterial and flame-retardants make it a more sustainable option than many competitors.
  • Sleepers on a budget. Considering its many luxury touches and excellent performance, the Saatva has an extremely reasonable price-point.

Not Recommended for...

  • Light sleepers. The Saatva performed poorly in our motion isolation tests due to the interconnected nature of its innersprings, making it less viable for anyone easily disturbed by referred movement.
  • Anyone in need of targeted pressure relief. While the Saatva’s comfort system and pocketed coil layer do provide better pressure relief than a traditional innerspring, those who require significant pressure relief should look elsewhere.

King Size Mattress Buying Guide

In the guide below, we’ll share everything you need to consider when buying a king size mattress, including pros and cons, king size variants, and the most common mattress material types.

What Is a King Size Mattress?

Introduced in the 1940s, king size mattresses are the largest standard size beds on the market. While variants are available, standard North American king size beds are 76 inches wide by 80 inches long. This works out to 6.3 feet wide by 6.6 feet long, which is the same length as a queen bed but significantly wider.

Why Buy a King Size Mattress?

Couples, parents, and pet owners often gravitate towards this size and its variants, as the extra space means there’s plenty of room for two or more sleepers. Interior design fans and those in search of a luxurious touch also tend to appreciate the king size for its aesthetically pleasing shape and opulent look.

However, if your heart is set on one of the more obscure variants (such as Alaska king), you might struggle to find it. King size beds also have a price tag to match their size, and can be heavy enough to make moving or repositioning them difficult.

  • Plenty of room for couples, families, and pet owners
  • Aesthetically pleasing, nearly square shape
  • Standard and California king sizes are widely available

Cons

  • More expensive than other mattress sizes
  • Can be very heavy and difficult to reposition or move
  • Larger than other beds and hard to fit into small rooms

What to Consider When Buying a King Mattress

Material

  • Foam: Made from materials like polyfoam and memory foam, all-foam beds have support cores made from high-density foam. While they have their downsides, such as low durability and a tendency to sleep warm, foam mattresses are among the most affordable on the market, are nearly silent,  and have excellent motion isolation.
  • Innerspring: Though most have thin comfort layers made from polyfoam, as well as a polyfoam base layer, the majority of an innerspring mattress is taken up by connected steel coils. This traditional mattress type is affordable and supportive, with superior airflow. However, they can also be noisy, with poor motion isolation and pressure relief.
  • Hybrid: Combining synthetic foam or latex with a pocketed coil support core, hybrid mattresses attempt to offer the benefits of these materials with fewer of the downsides. While the best hybrids achieve this with excellent scores across the board, they sometimes have high price-points and a tendency towards shorter lifespans.
  • Latex: While synthetic foams dominate the market, durable latex — extracted from rubber trees and manufactured as Dunlop or Talalay latex foam — is a cooler-sleeping, more natural alternative. Latex beds also offer good pressure relief, but they have downsides in the form of their weight, cost, and weak edge support.
  • Airbed: Made with either a thin foam layer or no comfort layer at all, airbed mattresses use inflatable chambers for support. They can be extremely customizable, allowing them to offer targeted support and pressure relief, and often have long lifespans. However, they can be expensive, are hard to find, and require maintenance.

Firmness and Feel

Preferences vary, but generally people under 130 pounds like softer beds, while those above 230 pounds find firm beds more comfortable, and those in the middle prefer softer or firmer beds depending on their sleep position. This is because sleep position preference also plays a major role in choosing the right mattress.

For example, side-sleepers usually require good pressure relief, as they have a tendency to develop pressure points at their hip and shoulder. Personal taste also plays a part, with the question of whether someone likes to feel as though they are sleeping ‘in’ or ‘on’ a mattress being left up to preference.

Bedding and Bed Frames

When purchasing a bed frame or bedding for your king size bed, it’s critical to make sure you have the right size. Variants like split and California king mattresses are a different shape than ordinary kings, and some mattresses are thicker than others.

Other Types of King Mattresses

While king is the original, there are also many king size variants. These range from the very common to the very uncommon, which may limit your choice of mattresses if you decide on a rare variant.

  • California King: The most common variant, California king beds are four inches longer and four inches narrower. This is ideal for tall sleepers, but less practical for families and pet owners in need of personal space. California kings are often the same price as a standard king.
  • Split King: Split kings are two twin XL mattresses which are placed side by side and are able to attach to one another. Couples often enjoy these beds and appreciate the lack of motion transfer.
  • Alaska King: One of the rarest king size variants, Alaska king mattresses are a massive 108 inches by 108 inches, or 9 feet square. Though hard to find, these beds are the largest on the market.
  • Wyoming King: Another rare variant is the Wyoming king, which is 84 inches, or seven feet, square. These are closer in size to the standard king, but are wider, longer, and perfectly square.

How to Find a Cheap King Size Mattress

As the largest mattresses on the market, some king size beds also come with an equally large price tag. To help our readers find the best king size mattress for them at a price they can afford, here are our three favorite tips for finding a budget bed:

  • Buy your mattress at the right time. The mattress industry tends to repeat sales at the same time every year, often around holidays. By timing your purchase, you’ll have a wide selection to choose from.
  • Shop online. Most internet-based mattress companies offer sleep trials and free shipping, on top of cutting out the cost of overhead and supplying exclusive deals. Online retailers also allow you to avoid the stress of in-person sales days.
  • Sharpen your bargain-hunting skills. When shopping in-person, it’s important to do everything you can to bring the price down. Negotiating with the staff is sometimes possible, and price-matching can be a good tactic where accepted.

King Size Mattress FAQ

  • Why buy a king size mattress?

    A king size mattress provides ample room for two or more sleepers, making it ideal for those who share a bed with a spouse, their children, a pet, or any combination thereof. Some individuals also prefer king size beds due to their aesthetically pleasing, nearly square shape.

  • What are the deminsions of a king size mattress?

    In North America, the standard king size bed is 76 inches wide by 80 inches long, making it the same length as a queen size, but significantly wider. Additionally, there are some variants on the king size with different measurements. A split king adds up to the same measurements but takes the form of two twin XL mattresses placed side-by-side. The California king size measures 72 inches wide and 84 inches long, giving tall sleepers more vertical room. An Alaska King measures 108 inches wide by 108 inches tall, and a Wyoming King measures 7 feet square.

  • Can I purchase a king size mattress in a box?

    Yes, many online brands offer bed-in-a-box mattresses in a standard king size. These brands will compress and roll-pack the mattress in plastic so that it may be shipped in a relatively small box right to your doorstep. However, specialty king sizes such as split king and California king are somewhat more difficult to find.

  • How can I protect my king size mattress?

    There are several types of mattress protectors and encasements that can help protect your king size mattress from various irritants, such as liquid spills, stains, dust mites, bed bugs, and allergens. Waterproof mattress protectors are a good idea if you plan on sharing the bed with a small child or a pet.

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