King Memory Foam Mattress

Find a King Memory Foam Mattress to complement your bedroom and support your sleep routine. Explore options in a range of styles and price points, then choose the size, feel and design that best suit your needs.

Sort & Filter

Sleepy's By Sealy Memory Foam Medium Mattress

3511

Starting at

$889⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's Basic Memory Foam Firm Mattress

3239

Starting at

$299⁷⁷

$999⁹⁹

$700 OFF

Firm Comfort, best for

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

Serta Perfect Sleeper Sleep Excellence Medium PillowTop Mattress

1443

Starting at

$1999⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

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

Beautyrest BR800 11.25" Firm Mattress

2242

Starting at

$1299⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

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

Tulo Bamboo 8" Medium Green Tea Memory Foam Mattress

5567

Starting at

$809⁹⁹

Medium Comfort, best for

Back, Side, Stomach Sleepers
Pain
Bed Partner
Temperature
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

Stearns & Foster Lux Estate Elite 16" Medium Euro Pillow Top Mattress

985

Starting at

$4099⁰⁰

$4699⁰⁰

$600 OFF

Medium Comfort, best for

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

Receive $300 Instant Gift⁴ with purchase.

Serta Perfect Sleeper Nurture Night 12" Firm Mattress

1194

Starting at

$999⁰⁰

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Nectar Classic 12" Firm Memory Foam Mattress

233

Starting at

$899⁰⁰

$1399⁰⁰

$500 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Serta Perfect Sleeper Nurture Night 13.5" Medium Mattress

1026

Starting at

$1099⁰⁰

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Serta Perfect Sleeper Oasis Sleep 14.5" Pillow Top Mattress

1015

Starting at

$1399⁰⁰

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

A king memory foam mattress offers generous space for couples, families and anyone who enjoys extra room to stretch out. Designed with responsive foam layers, a king memory foam bed contours to the body to help cushion pressure points around the shoulders, hips and back while supporting a more comfortable sleep posture. Memory foam also absorbs motion, making a king mattress an excellent choice for couples who want to reduce the feeling of a partner moving during the night. With a spacious 76-by-80-inch sleep surface, a king size mattress can create a relaxing, roomier bedroom experience without sacrificing the conforming comfort memory foam is known for. Choosing the best king memory foam mattress depends on your preferred firmness, sleep position and temperature needs. Side sleepers may appreciate a softer comfort layer that helps relieve pressure, while back and stomach sleepers often prefer medium or firmer support to promote balanced alignment. Cooling memory foam mattresses can include breathable covers, ventilated foam or temperature-regulating materials to help manage heat throughout the night. Pairing a king memory foam mattress with a compatible platform bed, adjustable base or solid foundation can provide dependable support and help extend the life of the mattress. Explore a range of king mattresses at Mattress Firm to find comfortable, supportive sleep tailored to your needs.

What is a king memory foam mattress made of + -

A king memory foam mattress typically includes a comfort layer made with memory foam and a supportive base layer made with high-density foam. Some models may also include cooling materials, quilted covers or other specialty foams.

How does a king memory foam mattress feel + -

Memory foam has a contouring feel that responds to body heat and pressure. The overall feel can range from plush to firm depending on the foam layers, construction and comfort preferences.

What types of covers are used on memory foam mattresses + -

Memory foam mattresses may feature removable or non-removable covers made with materials such as polyester, cotton or blended fabrics. Cover designs can vary in stretch, texture and breathability.

Can a king memory foam mattress be used with an adjustable base + -

Many memory foam mattresses are designed to work with compatible adjustable bases. Check the mattress and base specifications to confirm compatibility before pairing them.

How should a memory foam mattress be cared for + -

Use a compatible foundation, rotate the mattress only if the manufacturer recommends it and follow the care instructions for the cover. Avoid removing a non-removable cover or applying cleaning products that are not approved for the mattress materials.