Best King Size Mattresses of 2026

Find more room to rest with the best king size mattresses, ranked by customer review ratings to help you compare with confidence. Whether you’re sharing your bed or simply want extra space to stretch out, explore customer favorites to find the comfort and support that suit your sleep style

What to look for in king size mattresses

Finding the best king size mattress starts with choosing the right fit for your room, sleep position and comfort preferences

1. Size And Room Fit

A standard king mattress measures 76 inches wide by 80 inches long, offering plenty of space to stretch out. Measure your bedroom, doorways and bed frame to confirm the fit while leaving room to move around the bed.

2. Comfort And Support

Side sleepers often prefer cushioning around the shoulders and hips, while back and stomach sleepers may benefit from a firmer feel. Look for a mattress that balances pressure relief with support to help keep your spine aligned.

3. Materials And Temperature

Memory foam contours to your body, while innerspring and hybrid mattresses typically offer a more responsive feel. If you tend to sleep warm, consider breathable covers and materials designed to help manage heat.

4. Motion Isolation And Edge Support

If you share your king mattress, motion isolation can help limit disturbances when your partner changes positions. Strong edge support can also make the perimeter feel steadier when you sit or sleep near the side.

Beautyrest PressureSmart 2.0 Plush 11.75" Mattress

A breathable, plush king-sized mattress with targeted pressure relief and adjustable base compatibility.

6252

Plush Comfort, best for

Side Sleepers
Temperature
Bed Partner
Pain
Toss and Turn

Starting at

$1149⁷⁷

$2299⁹⁹

$1150 OFF

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest PressureSmart 2.0 Plush Pillow Top 13.75" Mattress

A plush, breathable mattress with targeted support and pressure relief for a refreshing sleep experience.

2696

Plush Comfort, best for

Side Sleepers
Temperature
Bed Partner
Pain
Toss and Turn

Starting at

$1199⁷⁷

$2399⁹⁹

$1200 OFF

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest BR800 13.5" Plush Pillow Top Mattress

A plush king mattress with Beautyrest Pocketed Coil springs for personalized support and cooling technology.

2801

Plush Comfort, best for

Side Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

Starting at

$1499⁹⁹

FREE ADJUSTABLE BASE ³ with code ELEVATE

Stearns & Foster Estate 14.5" Firm Mattress

A luxurious, firm king-size mattress with motion separation, pressure relief, and a cool-to-the-touch cover.

1844

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Allergies
Toss and Turn

Starting at

$3099⁰⁰

Receive $300 Instant Gift⁴ with purchase.

Beautyrest Silver BRS900 12" Plush Mattress

A plush king mattress with 900 Series Beautyrest Pocketed Coil Technology for flexible support and cool comfort.

1158

Plush Comfort, best for

Side Sleepers
Temperature
Pain
Bed Partner
Toss and Turn

Starting at

$1699⁹⁹

FREE ADJUSTABLE BASE ³ with code ELEVATE

Nectar Classic 12" Firm Memory Foam Mattress

A firm king-size memory foam mattress with motion separation, pressure relief, and breathable fabric.

238

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Starting at

$899⁰⁰

$1399⁰⁰

$500 OFF

Tempur-Pedic TEMPUR-ProAdapt 2.0 12" Medium Mattress

A medium comfort king-sized mattress with advanced pressure relief, motion separation, and breathable material.

3924

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Allergies
Bed Partner
Toss and Turn
Temperature

Starting at

$4199⁰⁰

Receive $300 Instant Gift⁴ with purchase + Calm app 3-month free trial

Beautyrest Black Series Four 17.5" Medium Summit Pillow Top Mattress

A luxurious black king-size mattress with a medium summit pillow top, breathable design, and pressure relief.

618

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Temperature
Bed Partner
Toss and Turn

Starting at

$6599⁰⁰

$300 ⁶ adjustable base instant gift with purchase.

Beautyrest Black Series Three 16.25" Medium Pillow Top Mattress

A luxurious black king-size mattress with medium comfort, advanced support, and enhanced cooling for an extraordinary rest.

478

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Starting at

$5199⁰⁰

$300 ⁶ adjustable base instant gift with purchase.

Tempur-Pedic TEMPUR-ProAdapt 12" Medium Previous Generation Mattress

A 12" medium firm king mattress with pressure relief, motion separation, and cooling technology.

6612

Medium Comfort, best for

Back, Side, Stomach Sleepers
Temperature
Pain
Allergies
Bed Partner
Toss and Turn

Starting at

$2869⁷⁷

$4099⁰⁰

$1229 OFF

What types of king mattresses can I choose from? + -

Common options include memory foam, innerspring, hybrid and latex mattresses. Memory foam typically has a contouring feel, innerspring mattresses have a more buoyant feel, hybrids combine coils with comfort layers and latex has a responsive feel.

How do I choose the right firmness for a king mattress? + -

Start with whether you prefer a plush, balanced or firm feel, then compare mattresses while lying in your usual sleeping position. Firmness labels can vary by brand, so use them as a starting point rather than an exact standard.

What is the difference between pillow top and tight top king mattresses? + -

A pillow top mattress has a distinct cushioning layer sewn onto its surface, while a tight top has a flatter profile without that separate layer. Either style can come in a range of firmness levels, so the top design alone does not determine the overall feel.

What type of base works with a king mattress? + -

Depending on its construction, a king mattress may work with a platform bed, a compatible foundation or an adjustable base. Check the mattress manufacturer's requirements for center support, slat spacing and adjustable base compatibility before choosing a base.

How should I care for a king mattress? + -

Use a mattress protector and follow the manufacturer's cleaning and rotation instructions. Many modern mattresses are designed for use on one side, so do not flip yours unless the care instructions recommend it.