Modern King Size Back Support Mattress

Explore options for a Modern King Size Back Support Mattress at Mattress Firm. Shop king size mattresses in a variety of comfort levels, materials and styles to help you create a bedroom that fits your sleep preferences and space.

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Sleepy's By Sealy Memory Foam Medium Mattress

3474

Starting at

$889⁹⁹

Medium Comfort, best for

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

Beautyrest PressureSmart 2.0 Firm 11" Mattress

Starting at

$1099⁹⁹

$2199⁹⁹

$1100 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Temperature
Bed Partner
Pain
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's Basic Memory Foam Firm Mattress

3213

Starting at

$299⁷⁷

$999⁹⁹

$700 OFF

Firm Comfort, best for

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

Sleepy's By Sealy Memory Foam Plush Mattress

2776

Starting at

$999⁹⁹

Plush Comfort, best for

Side Sleepers
Pain
Bed Partner
Toss and Turn
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Serta Perfect Sleeper Charlotte 2.0 Medium Euro Top Mattress

2615

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

Sleepy's Rest Medium Innerspring Mattress

7001

Starting at

$344⁰⁰

$1249⁹⁹

$906 OFF

Medium Comfort, best for

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

Sleepy's Rest Firm 2.0 Innerspring Mattress

7001

Starting at

$449⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Beautyrest PressureSmart 2.0 Plush Pillow Top 13.75" Mattress

2695

Starting at

$1199⁹⁹

$2399⁹⁹

$1200 OFF

Plush Comfort, best for

Side Sleepers
Temperature
Bed Partner
Pain
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Serta Perfect Sleeper Sleep Excellence Medium PillowTop Mattress

1433

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 BR800 13.5" Plush Pillow Top Mattress

2784

Starting at

$1499⁹⁹

Plush Comfort, best for

Side Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest PressureSmart 2.0 Hybrid Medium 13" Mattress

1758

Starting at

$1474⁹⁹

$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

3296

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

2233

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

1809

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.

Sealy Essentials Sudley 8.5" Firm Mattress

989

Starting at

$499⁹⁹

$999⁹⁹

$500 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Temperature
Bed Partner
Toss and Turn

Tulo Bamboo 10" Medium Green Tea Memory Foam Mattress

5555

Starting at

$889⁹⁹

Medium Comfort, best for

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

A modern king size back support mattress can help create a more balanced sleep surface for couples who want generous space, pressure relief and dependable alignment. The best king mattress for back support typically combines responsive comfort with sturdy support, allowing your shoulders and hips to settle without letting your midsection sink too deeply. Medium-firm mattresses are often a practical starting point for back sleepers, while side sleepers may prefer cushioning layers that relieve pressure around the shoulders and hips. Hybrid mattresses with individually wrapped coils and supportive foam can provide airflow, durability and targeted support, while memory foam mattresses contour closely to the body for a more cushioned feel. Comparing mattress firmness, comfort layers, lumbar support, motion isolation and edge support can make it easier to find a comfortable king mattress that suits your sleep position and everyday needs. A quality modern king size mattress should also work well with a sturdy bed frame or adjustable base designed to support its weight and dimensions. Zoned support systems, high-density comfort foam and responsive coils can help promote a neutral spine position without creating an overly rigid feel, making them useful features to consider in a back support mattress. Couples can also benefit from a king size sleep surface that reduces motion transfer and offers reinforced edges for more usable space. Mattress Firm carries a wide selection of king mattresses in memory foam, hybrid and innerspring designs, including options from trusted brands and Sleep Experts® guidance to help you compare materials, firmness levels and sleep technologies. The right mattress can make your bedroom feel more inviting while supporting comfortable, restorative sleep night after night.

What features are common in modern back support mattresses + -

Modern back support mattresses often feature zoned construction, individually wrapped coils, responsive foam or a combination of materials designed to provide a balanced feel and consistent surface support.

Which mattress firmness is best for back support + -

Firmness preference varies from person to person. A medium to medium-firm feel is a popular starting point, while sleepers should also consider their preferred sleep position, body type and comfort needs.

Are hybrid mattresses a good option for back support + -

Hybrid mattresses combine foam comfort layers with an innerspring or pocketed coil support system. This construction can offer a balance of cushioning, responsiveness and a supportive feel.

What mattress materials can help create a supportive feel + -

Memory foam, latex, polyfoam and pocketed coils are common materials in supportive mattress designs. Each offers a different balance of contouring, responsiveness, breathability and surface feel.

How do I choose a modern mattress for my preferred sleep position + -

Side sleepers often look for cushioning around the shoulders and hips, back sleepers may prefer balanced contouring and support, and stomach sleepers commonly look for a more stable, supportive surface.