King Mattresses With Comfort Core

Explore King Mattresses With Comfort Core at Mattress Firm to find a spacious mattress option for your bedroom. Compare available sizes, prices and purchase options to help you choose a king mattress that fits your sleep preferences and budget.

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Beautyrest PressureSmart 2.0 Firm 11" Mattress

Starting at

$1100⁰⁰

$2199⁹⁹

$1100 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Temperature
Bed Partner
Pain
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Serta Perfect Sleeper Charlotte 2.0 Medium Euro Top Mattress

2621

Starting at

$1499⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Tempur-Pedic TEMPUR-Adapt 11" Medium Previous Generation Mattress

3652

Starting at

$2029⁷⁷

$2899⁰⁰

$869 OFF

Medium Comfort, best for

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

Beautyrest PressureSmart 2.0 Hybrid Medium 13" Mattress

1758

Starting at

$1475⁰⁰

$2949⁹⁹

$1475 OFF

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Silver BRS900 11.75" Extra Firm Mattress

3306

Starting at

$1699⁹⁹

Extra Firm Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Stearns & Foster Estate 14.5" Firm Mattress

1829

Starting at

$2799⁰⁰

$3099⁰⁰

$300 OFF

Firm Comfort, best for

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

Receive $300 Instant Gift⁴ with purchase.

Tulo Bamboo 10" Medium Green Tea Memory Foam Mattress

5567

Starting at

$889⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Silver BRS900-C 13.75" Extra Firm Mattress

1816

Starting at

$1999⁹⁹

Extra Firm Comfort, best for

Back, Stomach Sleepers
Temperature
Pain
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Silver BRS900 11.75" Medium Firm Mattress

1753

Starting at

$1099⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Purple Original Mattress

59759

Starting at

$1760⁰⁰

$2199⁰⁰

$439 OFF

Medium Comfort, best for

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

Sleepy's By Sealy Slumber Cushion Firm Mattress

303

Starting at

$1999⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest BR800 12" Plush Euro Top Mattress

745

Starting at

$1399⁹⁹

Plush Comfort, best for

Side Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Silver BRS900 12" Plush Mattress

1149

Starting at

$1699⁹⁹

Plush Comfort, best for

Side Sleepers
Temperature
Pain
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Tempur-Pedic TEMPUR-ProAdapt 2.0 12" Medium Mattress

3881

Starting at

$3799⁰⁰

$4199⁰⁰

$400 OFF

Medium Comfort, best for

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

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

Tempur-Pedic TEMPUR-Adapt 2.0 11" Medium Mattress

3678

Starting at

$2799⁰⁰

$2999⁰⁰

$200 OFF

Medium Comfort, best for

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

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

Purple RestorePlus 13" Soft Hybrid Mattress

3536

Starting at

$3600⁰⁰

$4399⁰⁰

$799 OFF

Plush Comfort, best for

Side Sleepers
Pain
Allergies
Bed Partner
Toss and Turn
Temperature

Beautyrest Black Series Three 15.25" Medium Mattress

2307

Starting at

$4199⁰⁰

$4799⁰⁰

$600 OFF

Medium Comfort, best for

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

$300 ⁶ adjustable base instant gift with purchase.

Tempur-Pedic TEMPUR-LuxeAdapt 2.0 13" Medium Hybrid Mattress

2290

Starting at

$5099⁰⁰

$5599⁰⁰

$500 OFF

Medium Comfort, best for

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

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

Beautyrest Black Series Three 15" Firm Mattress

2247

Starting at

$4199⁰⁰

$4799⁰⁰

$600 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Purple RestorePlus 13" Firm Hybrid Mattress

1667

Starting at

$3600⁰⁰

$4399⁰⁰

$799 OFF

Firm Comfort, best for

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

Purple Restore 11.5" Soft Hybrid Mattress

1666

Starting at

$2700⁰⁰

$3399⁰⁰

$699 OFF

Plush Comfort, best for

Side Sleepers
Pain
Allergies
Bed Partner
Toss and Turn
Temperature

Tempur-Pedic TEMPUR-LuxeAdapt 2.0 13" Soft Mattress

1538

Starting at

$5099⁰⁰

$5599⁰⁰

$500 OFF

Plush Comfort, best for

Side Sleepers
Pain
Allergies
Bed Partner
Toss and Turn
Temperature

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

Beautyrest Black Series Three 16.75" Plush Pillow Top Mattress

1471

Starting at

$4599⁰⁰

$5199⁰⁰

$600 OFF

Plush Comfort, best for

Side Sleepers
Bed Partner
Pain
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Purple RestorePlus Cool Touch 13" Hybrid Mattress

1013

Starting at

$3900⁰⁰

$4699⁰⁰

$799 OFF

Medium Comfort, best for

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

$300 ^◇ adjustable base instant gift with purchase.

Tempur-Pedic TEMPUR-Adapt 11" Medium Hybrid Previous Generation Mattress

942

Starting at

$2239⁷⁷

$3199⁰⁰

$959 OFF

Medium Comfort, best for

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

Purple RestorePremier Cool Touch 13" Hybrid Mattress

857

Starting at

$4700⁰⁰

$5499⁰⁰

$799 OFF

Medium Comfort, best for

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

$300 ^◇ adjustable base instant gift with purchase.

King mattresses with Comfort Core are designed to provide a supportive, comfortable sleep surface with plenty of room to stretch out. A king mattress measures 76 inches wide by 80 inches long, making it a popular choice for couples, families and anyone who enjoys extra personal space while sleeping. Comfort Core technology may help create a balanced feel by combining supportive materials with cushioning comfort, so you can settle into bed with the right amount of pressure relief and stability. Explore king-size mattresses in a variety of feels, including plush, medium and firm options, to find the comfort level that best matches your sleep style. Choosing the right king mattress with Comfort Core starts with considering your preferred firmness, sleeping position and support needs. Side sleepers may appreciate a mattress with cushioning for the shoulders and hips, while back and stomach sleepers often prefer a more supportive surface that helps maintain a comfortable sleep posture. Couples can also look for features such as motion isolation, breathable materials and reinforced edges for a more comfortable night’s sleep. At Mattress Firm, you can compare king mattresses with Comfort Core alongside other mattress technologies, shop trusted brands and find a mattress that helps you sleep well so you can live well.

What is a Comfort Core in a mattress? + -

A Comfort Core is a designated comfort layer or support zone within a mattress. It may include materials such as memory foam, latex or quilted fibers, depending on the mattress design.

What materials are used in king mattresses with Comfort Core? + -

These mattresses may combine a Comfort Core with materials such as gel memory foam, TEMPUR-Material™, latex, innerspring coils, individually wrapped coils or breathable fibers. Check each mattress description for its specific construction.

Are king mattresses with Comfort Core available in different firmnesses? + -

Yes. King mattresses with Comfort Core are available in a range of feels, from plush to firm. Consider your preferred comfort level and mattress construction when comparing options.

How do I care for a king mattress with Comfort Core? + -

Use a supportive foundation recommended by the manufacturer, rotate the mattress only if the care instructions allow it and protect the surface with a properly fitted mattress protector. Always follow the product-specific care guide.

Can I use an adjustable base with a king mattress with Comfort Core? + -

Some king mattresses with Comfort Core are compatible with adjustable bases, while others are designed for a stationary foundation. Review the mattress and base specifications before pairing them.