High Density King Mattresses

Shop high density king mattresses at Mattress Firm to find a spacious sleep solution for your bedroom. Explore available king mattress options and discover the right fit for your sleep preferences, comfort needs and space.

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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.

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

6573

Starting at

$2869⁷⁷

$4099⁰⁰

$1229 OFF

Medium Comfort, best for

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

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 BR800 13.5" Plush Pillow Top Mattress

2795

Starting at

$1499⁹⁹

Plush Comfort, best for

Side Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

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

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

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

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

Serta Perfect Sleeper Oasis Sleep 14.5" Firm Pillow Top Mattress

1187

Starting at

$1399⁰⁰

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

High density king mattresses are designed with resilient, supportive materials that help create a stable sleep surface for couples and individuals who prefer extra room to stretch out. In a king size mattress, high-density foam can provide consistent pressure relief and help distribute body weight evenly across the bed, while a supportive core helps promote proper spinal alignment. Memory foam king mattresses may contour closely to the body to reduce motion transfer, making them a comfortable choice for partners with different sleep schedules. Hybrid king mattresses combine high-density foam with individually wrapped coils to balance cushioning, airflow and responsive support. Comparing foam density, mattress firmness, comfort layers and construction can help you choose the best high density king mattress for your preferred sleep position and comfort needs. A high density king mattress can also be a practical choice for shoppers who want lasting support and a spacious sleep surface. Measuring approximately 76 inches wide by 80 inches long, a king mattress offers plenty of personal space for couples, while durable foam and reinforced support layers can help the mattress maintain its feel over time. Side sleepers may prefer a plush or medium mattress with pressure-relieving foam around the shoulders and hips, while back and stomach sleepers often benefit from a medium-firm or firm king mattress that supports the midsection. Pair your mattress with a compatible king bed frame or foundation, and look for features such as cooling materials, edge support and a sleep trial to find high density king bedding that suits your comfort preferences.

What is a high-density king mattress made of? + -

A high-density king mattress typically features high-density foam in one or more comfort or support layers. It may also include memory foam, polyfoam, latex, coils or a combination of materials.

How does high-density foam affect the feel of a mattress? + -

High-density foam can create a more substantial, supportive feel with less immediate sink than lower-density foam. The overall feel also depends on the mattress’s firmness, comfort layers and construction.

Are high-density king mattresses available in different firmness levels? + -

Yes. High-density mattresses can be designed with soft, medium, firm or hybrid feels. Compare the comfort layers and support system to find a feel that matches your sleep preferences.

What types of mattress covers are used with high-density mattresses? + -

High-density mattresses may have quilted fabric covers, breathable knit covers or removable covers, depending on the design. Cover materials can affect the surface feel and overall look of the mattress.

How should you care for a high-density mattress? + -

Use a compatible foundation, rotate the mattress if the care instructions recommend it and protect the surface with a properly fitted mattress protector. Always follow the manufacturer’s care guidelines.