The Best King Size Bed Mattresses Reviewed for 2021

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Many couples dream of upgrading to a king-size mattress. A large king bed provides sleepers with plenty of room to stretch out and enough personal space so both partners feel comfortable, even with a dog or a few kids in the bed. These large mattresses are a favorite of couples to sleep with ease.

Buying a king size mattress can be daunting, as they are not only big but often expensive. With so many options to choose from it's hard to know where to begin, so we've broken it down to make it simple.

Our list covers some of our top picks in the most popular categories. We’ve studied hundreds of different beds, and these are the ones we consider to be the top king sized mattresses.

nectar bed small product image Nectar
  • Type: Memory Foam
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layla bed new medium product image Layla
  • Type: Memory Foam
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the alexander signature hybrid small image Alexander Signature Hybrid
  • Type: Hybrid
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Small Image Of Casper Original Mattress Casper
  • Type: All Foam
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small product image of dreamcloud premier DreamCloud Premier
  • Type: Hybrid
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Small Product Image of Zenhaven by Saatva Zenhaven
  • Type: Latex
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Saatva small product image Saatva
  • Type: Hybrid
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Brooklyn Aurora small product image Brooklyn Aurora
  • Type: Hybrid
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nolah original bed small product image Nolah
  • Type: All Foam
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helix sleep small image Helix
  • Type: Hybrid
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medium product image of winkbeds PLUS WinkBeds Plus
  • Type: Hybrid
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small product image of copper dreams Copper Dreams
  • Type: Memory Foam
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12 Top-Rated King Size Mattress Reviews

Nectar – Great Overall Value

HIGHLIGHTS:

  • Memory Foam Mattress
  • Great for Side and Back Sleepers
  • Firmness Level: 6.5
  • 365-Night Trial Period
  • Forever Warranty

For shoppers who are looking for value but are not willing to sacrifice supportive comfort, Nectar paves the way to quality sleep. With several layers of pressure-relieving and cooling gel memory foam, shoppers can look forward to a comfortable night’s sleep.

Nectar’s price has been attractive to online shoppers not only because it is such a fair deal, but the brand goes beyond expectations by using a variety of quality foams that offer temperature regulation and gentle comfort.

So, what’s the big deal?

  • The company provides customers with a generous 365-Night Sleep Trial and Forever Warranty with their purchase of a Nectar Mattress.
  • The CertiPUR-US Certification means the products used in this bed have been rigorously tested for safety. CertiPUR-US guarantees the product is made without heavy metals, flame retardants, and emits low level of VOCs for healthy air quality.

Layla – True Memory Foam Feel

HIGHLIGHTS:

  • Foam Mattress
  • Great For All Sleeping Positions
  • Firmness Level: 4/10 (Soft Side) 7/10 (Firm Side)
  • 120-Night Trial Period
  • Lifetime Warranty

This double-sided memory bed sports a Soft and Firm feel on either side of the mattress. Two firmnesses equal more versatility, allowing nearly all sleepers to enjoy the pressure relief of memory foam with a firmness option that should fit their needs.

Those who enjoy a Soft feel can flip Layla to its white and grey side, while customers who prefer a Firm feeling can rest on the darker colored side. The Firm side allows customers to slowly fall into a gentle cradle, while the Soft end envelops them in a deep hug.

What makes the Layla mattress so special?

  • Layla envelops their bed in a viscose, lycra, and polyester cover that uses proprietary ThermoGEL for additional cooling. They avoid the common pitfalls of memory foam by using copper to better maximize temperature regulation and support.
  • Both dark and light sides foster a slow response and steady contour that only memory foam mattress can provide.

Alexander Signature Hybrid – Hybrid

HIGHLIGHTS:

  • Hybrid Mattress
  • Best For Side Sleepers
  • Firmness Level: 6/10 
  • 100-Night Sleep Trial
  • Lifetime Warranty

Hybrid mattresses offer sleepers the best of both worlds, providing the support of coils and the contouring comfort and pressure relief of foam. With a luxurious feel and sleek design, it is little surprise that this is a top-selling model from Nest Bedding.

The inside is layered with Quantum® Edge pocketed coils, topped off with a series of conforming foams that help relieve stress. This well-crafted, combination of materials provides more than bare necessities of comfort and support, by also fostering pressure relief, motion isolation, and temperature regulation throughout the design.

Why the Alexander Signature Hybrid?

  • The Alexander Signature Hybrid comes in varying firmness options: Luxury Firm, Medium, and Plush for customizable comfort.
  • The Quantum® Edge pocketed coils are sturdy and durable, providing excellent edge support, which is great for couples looking to maximize surface area, or if you have difficulty getting out of bed.

Casper – Versatile

HIGHLIGHTS:

  • Foam Mattress
  • Great For Back Sleepers
  • Firmness Level: 6/10
  • 100-Night Sleep Trial
  • 10-Year Warranty

Casper has had huge success since its inception, the brand now has three all-foam beds that help sleepers of all types find a good night’s rest. This is an extremely versatile mattress, allowing people of nearly all positions to find comfort with varying needs.

Casper’s Wave and Element have similar features as the Casper, though the Wave is slightly more advanced and comes at a higher price point, while the Element is more simplified.

Casper’s medium firm feel is a great comfort level for a wide variety of body types and sleeping positions, making it our top pick for versatility.

What makes it special?

  • The Casper mattress has a Zoned Support™ foam that is designed to maintain spinal alignment and proper support while providing excellent pressure relief. This layer uses foams of varying densities to target the different parts of the body for ultimate comfort.
  • Sleepers should gently sink through responsive foams that combination sleepers should find easy to move around in.

DreamCloud Premier – Affordable Luxury

HIGHLIGHTS:

  • Hybrid Mattress
  • Great For Side Sleepers
  • Firmness Level: 5.5/10
  • 365-Night Trial
  • Lifetime Warranty

Five different layers of foams and individually wrapped coils help this bed reach its 14-inch profile. This design was made to help sleepers obtain maximum shuteye by targeting their comfort and support needs.

The brand believes that everyone deserves to have a luxury-style bed, and DreamCloud Premier works hard to provide all sleepers with a premium mattress for better rest. This bed’s price tag is cheaper than many other luxury brands but does not sacrifice on quality.

What is so special about DreamCloud Premier?

  • DreamCloud Premier is furnished with a Cashmere-blend cover that’s quilted to 2 inches of foam, including 1 inch of gel-infused memory foam. This should provide excellent pressure relief for those struggling with shoulder or hip pain.
  • Reinforced edges allow couples to take advantage of the full surface area and should be helpful for those needing support getting out of bed.

Zenhaven – Latex

HIGHLIGHTS:

  • Talalay Latex mattress
  • Great For Hot Sleepers And Allergy Sufferers
  • Firmness Level: 5/10 (Luxury Plush Side) 7/10 (Gentle Firm Side) 
  • 180-Night Trial
  • 20-Year Warranty

Coming from the e-commerce brand Saatva, Zenhaven is a luxury mattress that is only one flip away from your desired feel. Simply turn the bed over to experience one of two firmness options: Luxury Plush or Gentle Firm.

This mattress was manufactured using four layers of American Talalay Latex. Each layer varies in firmness, allowing this bed to foster, not one, but two luxurious sleep preferences. This is quality latex, has been OEKO-TEX® certified and is an antimicrobial material.

Why this bed?

  • Surpassing all these great features is Zenhaven’s overall comfort level and long-lasting durability. This bed may leave many customers wishing they could sleep well into the next day.
  • Zenhaven generously provides white glove delivery with the purchase of their mattress, so you do not have to worry about setting up your bed or taking down your old setup because they will do it for you.

Saatva – Innerspring

HIGHLIGHTS:

  • Hybrid Mattress
  • Great For Back And Stomach Sleepers
  • Three firmness levels: firm, luxury firm, and plush soft
  • 180-Night Trial
  • 15-Year Warranty

Saatva’s sales model cuts down prices by selling directly to customers online. Night after night, this affordable luxury provides sleepers the opportunity to sleep on ultra relieving comfort.

Saatva implements a double spring design, with strong coils beneath a pocket coil system that helps maximize bounce, comfort, overall support. This option should be great for combination sleepers. The responsiveness assists with rolling over and the extra bounce could be ideal for couples wanting something new in their sex life.

Why do we love it?

  • Topping off Saatva is an euro pillow top crafted from organic cotton. Beneath this is a layer of memory foam that helps with pressure relief and increasing the overall comfort of the bed.
  • Saatva offers free white glove delivery, meaning there is no unboxing period or heavy lifting. You can throw sheets and pillows on it right away and enjoy a luxurious night of sleep right away.

Brooklyn Aurora – Cooling

HIGHLIGHTS:

  • Hybrid Mattress
  • Best for Hot Sleepers
  • Firmness Level: 6.5/10
  • 120-Night Trial
  • 10-Year Warranty

Brooklyn Bedding is headquartered in Phoenix, Arizona, so these mattress makers know what sleeping hot feels like. In part, this is why the brand developed its Aurora mattress, to fight the heat for their local customers. It ranks among the top cooling beds available on the market.

The Aurora’s cover uses a tech called phase-change thermo knitting. This fabric’s temperature adapts to the surrounding area, keeping it several degrees cooler than the room. Topping off the first layer is a copper gel Energex™ foam with embedded TitanCool™, a gel designed to conduct heat towards the edges of the bed and away from the sleeper.

Why did it make our list?

  • This hybrid incorporates a mix of memory and proprietary foams topped over a system of pocketed coils that add quite a bit of bounce.
  • Customers can choose from three firmness options: Soft, Medium, or Firm for customized comfort for every need.

Nolah – Socially Conscious

HIGHLIGHTS:

  • Hybrid Mattress
  • Best For All Types Of Sleepers
  • Firmness Level: 7/10 (Medium Firmness Model)
  • 120-Day Trial
  • 15-Year Warranty

The brand constructs their bed with their patented Nolah Air Foam™, a material intended to replace latex and memory foams. This material responds like latex but conforms more like memory foam. These attributes make it a good choice for repositioning sleepers and it should additionally wash away some serious strain for back and side sleepers.

Nolah fosters a soft hug like feel that leaves most sleepers wanting more each night. The responsive Nolah Air Foam™ makes this a good choice for combo sleepers, as well as back and side sleepers.

What makes Nolah so special?

  • Nolah strives to give back to the earth. Thanks to Defenders of Wildlife and Nolah, a wild animal is adopted with each purchase of a Nolah Mattress.
  • Additionally, if at any point in the 120-Night sleep trial sleepers are not satisfied with their product, they are eligible for a complete refund and Nolah arranges with the customer to donate the bed to a local charity.

Helix – Customizable

HIGHLIGHTS:

  • Hybrid Mattress
  • Great For All Sleepers
  • Firmness Level: Customizable 
  • 100-Day Trial
  • 10-Year Warranty

This company has changed how shoppers can find a mattress. Helix can be ordered in a variety of firmnesses, feels, and designs. Helix has facilitated mattress shopping by presenting customers with their quiz, which takes into account the sleeper’s preferences, sleeping positions, weight, height, and more.

This quiz matches customers to one of the brand’s six options, which can all be purchased in a Luxe or Standard edition. Helix also sells one model made specifically for Big and Tall folks.

What else makes Helix stand out?

  • Helix uses a system of coils topped by various types of foam, based on the desired customization. For those shoppers wanting a Luxe model, these beds include zoned lumbar support and an ultra-cool cover that furnishes the pillowtop.
  • The reinforced edges on all models offer supreme edge support, allowing for additional supporting getting in and out of bed, and letting couples spread out and take advantage of the entire surface area.

WinkBeds Plus – Heavy Folks

HIGHLIGHTS:

  • Hybrid Mattress
  • Best For Side Sleepers
  • Firmness Level: 6/10
  • 120-Day Trial
  • Lifetime Warranty

WinkBed has been a trailblazer in the online bedding market. Their brand has successfully cut down costs by cutting out old-school mattress salesmen by selling directly to customers.

There are not too many bedding brands out there that cater to people who have higher than normal weight considerations. This bed uses a durable coil system and a thoughtful design that targets stability for heavier folks.

Why should customers buy this mattress?

  • Taking into consideration common overheating issues, WinkBed employs multiple features to regulate temperature. The bed includes a Tencel cover which is said to be 30% cooler than most linen covers, gel-infused EuroTop to draw heat away from bodies, as well as coils for additional ventilation.
  • When shoppers order a WinkBed Plus, they can be confident knowing that they are ordering a bed made for them. To prove it, WinkBed covers their product with a Lifetime Warranty.

Copper Dreams Gel Memory Foam – Budget Option

HIGHLIGHTS:

  • Foam Mattress
  • Great For Side Sleepers
  • Firmness Level: 5/10
  • 120-Day Trial
  • 10-Year Warranty

Dreamfoam sells a fantastic lineup of beds for sleepers on a tighter budget. Among these is the Copper Dreams, a bed that surpasses the value of many competing brands for its deep hugging, conforming comfort.

People who enjoy an exceptionally soft mattress should particularly appreciate how the Copper Dreams helps with pressure relief and how it contours to their hips and shoulders. This bed should hold great value for those sleepers looking for that slow contouring feel that memory foam mattress provides, and it’s delivered in a box for your convenience.

Why is it special?

  • The Copper Dreams provides excellent motion isolation, allowing partners to sleep together without much movement disturbance.
  • This bed’s pressure-relieving abilities are fantastic, offering gentle support and luxurious relief for those who struggle with hip and shoulder pain.
  • The price tag on this bed undercuts other memory mattresses by a significant margin and does so with no sacrifice to comfort.

Buyer's Guide for Purchasing a King Size Mattress

Benefits of This Size

A King mattress is the size most sleepers hope to dream on at some point. If you are reading this article, hopefully, this means your King sized bed is just beyond the horizon.

A King size mattress is a great transition for people used to sleeping on Queen that find that they now need some extra room. This size provides sufficient surface area for two sleepers to stretch and spread out, so hopefully no more sleeping on the edge.  If sleepers have kids or fluffy friends hopping in and out of bed, the surface area of a King can give everyone the space they need.

In addition to this, a King offers distance between sleepers, a feature that not only provides more room but also helps with motion isolation when one partner experiences a restless night’s sleep. If you co-sleep, this dimension facilitates cuddling but also leaves plenty of room to spread out when cuddle time ends. If cuddle time leads to something else, a King size mattress can be ideal for night time activities.

This size is also great for heavier and taller individuals who literally need more space to distribute their weight and stretch out.

Interested in exploring further? Look into our full mattress size chart.

Illustration of Two Sexually Active People in the Bed

King and California King Differences

A King mattress is going to be wider while a California King is going to be slightly longer. Both have the same overall surface area. Here are the key differences between the King and California King:

  • A King mattress is 76” x 80”. This is the most common size and the dimension is good for most couples and people who just need some extra space along the edge of the bed. This is 16 inches wider than a standard Queen size mattress and the same length as a Queen.
  • A California King is 72” x 84”. This model often works for taller individuals who need some extra foot room. The California King takes 4 inches from the width and adds that to the length. This would be 12 inches wider than a standard Queen and 4 inches longer.

Both of these can be split into a form of split King, though it is more commonly found in the standard King sized model.

View Our Full Comparison: King vs. California King

The Split King

For those with sleeping partners, it is likely that you both do not love the same exact feel of a bed. The Split King is a very common option for folks who co-sleep. What this provides is two halves of the bed, each with its own unique feel.

Maybe you like a soft mattress, while your partner prefers a firmer sleeping surface. Unlike your old sleeping arrangement, you don’t need need to compromise with a medium firm feel, the Split King can give both partners their perfect firmness.

This setup can be done in a few different ways. Often times a Split King setup will be two Twin XL mattresses lined up side by side. These work great with an adjustable base, as the sleepers not only get the feel they want but they can also set up the base in their preferred position.

Some companies will make a bed that splits at the head and leave the foot of the bed together. These types of King size mattresses can typically only be used with adjustable bases where only the head of the bed adjusts.

California Kings do come in split options, though these may be harder to find than a split, standard King size mattress.

Top Shopping Considerations

Material Type

Illustration of Memory Foam, Latex and Innerspring Mattress

Beds come in all shapes, sizes, and makes. The material that sleepers choose to sleep on is going to drastically affect how they rest.

The most common materials are coils, polyfoams, memory foams, and latex. Many beds today use a mix of all of these in their construction. Here is a quick breakdown of what you might see.

  • Coils: Most innerspring mattresses these days don’t use the same type of springs your grandma and grandpa grew up on. Many bed-in-a-box brands use a pocket coil that keeps the bounce while isolating motion. These are typically part of a hybrid and topped with some sort of foam.

    Read More:
    Best Innerspring Mattresses


  • Foams: There are a lot of different types of foams out there, but the two most common are memory foam and polyfoam. Memory foams are going to be slow responding and contour tightly to curves for pressure relief. Where polyfoams will have more of a quick response that helps wipe away strain.

    For More Info:
    Best Rated Memory Foam Beds


  • Latex: Latex is a type of rubber foam. There are typically two types – Talalay and Dunlop latex. These differ in construction but have a very similar feel and quick responsiveness, gently contouring to sleepers bodies and cradling their curves.

    Read Our Full Guide:
    Top Latex Mattresses

Preferred Sleeping Position

Animated Gif Of a Combination Sleeper

What position the shopper sleeps in should determine what type of bed they want to order. The following are the four most common sleeping positions: back sleeper, side sleeper, stomach sleeper, and combinations sleeper.

Side sleepers typically like a soft bed that can relieve pressure from their hips and shoulders, as these areas put more pressure into a bed over a smaller surface area.

Back sleepers usually enjoy something that can help distribute their weight evenly over the surface of the bed. A medium feel often works for these folks as this will fill in the gap between their hips and shoulders without throwing off their alignment.

Stomach sleepers often drift towards a firmer bed. These types of mattresses keep their hips elevated and level with their shoulders. An overly soft bed could cause their hips to dip too low into the mattress.

Combination sleepers need a bed that targets all 3 sleeping positions, usually something with a medium feel and more responsiveness to help them move around.

Whatever position you sleep in, be sure you are getting something that caters to your body type so you can get the proper support your body needs.

Get More Info: Best Sleeping Positions

Firmness Level

The firmness of your mattress is going to affect how you sleep. Something overly soft can leave you feeling stuck in bed, while something too firm can feel like concrete.

Beds are usually categorized as Soft, Medium, or Firm, with some variance in between. Certain brands may use different firmness titles, so reach out if you are unsure.

Need more info? Check out our complete mattress firmness guide.

Couples Sharing Space

King mattress could be a great bed for couples wanting to sleep together but don’t want to fall asleep cuddling. This lets sleepers spread out while also giving more room for sexual activities.

If you have kids, a King size mattress offers enough space for family cuddles in the morning.

Want more details? See our best bed for couples review.

Trial Period

Most companies offer some sort of trial period. Some brands even offer up to a full year. These trials allow shoppers to try these beds out in their homes within the allotted time and if they are not satisfied with their purchase they can either return their mattress or exchange it for a new model.

Warranty

Brands offer varying warranties, some even provide lifetime protection. Warranties typically cover manufacturing errors or abnormal wear and tear of a product. If damage occurs within the time of the warranty, the brand will usually ship their customers a new mattress.

Certifications

These are given by third parties that test beds for safe amounts of chemicals and heavy metals. Certifications are also given for brands that have gone above and beyond national safety requirements and strive to clean up their production with organic and all natural materials and manufacturing. These certifications can vary, so be on the lookout between brands.

Additional Features

Some brands will provide extra services and features. This could be anything from handles that make the bed easier to carry, all the way to White Glove Delivery, a service where your bed is installed for you. Some mattresses may be hypoallergenic, a smart bed, or have special features that help with edge support or cooling.

Frequently Asked Questions

Are there any cheap models?

King size mattresses are typically more expensive, so a less expensive model could present huge savings. There are cheaper models out there, but be careful that you are not confusing “cheap” with “affordable.” So you can get the most out of your money, do your best to research by comparing brands and materials.

View Our Full Guide: Top-Rated Budget Mattress

Are they worth the money?

Yes and no; some beds are going to be far more expensive than other brands that sell a similar or identical bed. Again, this is where it is important to compare brands to make sure you are getting a fair deal. There are plenty of good King sized mattresses out there that are worth the price tag.

Should I use a king topper?

If you are buying a new bed, you may as well buy it right the first time and get what you are looking for in a mattress and not spend additional money on a topper. If you currently have a King mattress and think it needs just a slight adjustment, a topper could be a good way to get the feel you want.

Follow Our Complete Guide: Best Mattress Toppers

Conclusion

So now that you know all about King size mattresses, hopefully, you are ready to get out there and find the bed of your dreams. If you still need help, check out our top-rated mattress list, for some additional beds that might fit your needs.

Good luck and happy shopping!

Rachael is a content writer for Sleep Advisor who loves combining her enthusiasm for writing and wellness. She’s had a passion for writing since she was a kid when she wrote awful poetry. She’s honed her craft quite a bit since then and considers herself a lucky duck to get paid to do what she loves.

Embracing the remote work life, she occasionally takes her work on the road and lives out her travel writer pipe dream.

In her free time, she attempts to meditate regularly, rides her bike to Trader Joe’s, and enjoys trying every type of food that she can get her hands on.

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