Firm Back Support King Mattresses

Discover the ultimate sleep experience with firm back support king mattresses, designed to provide the stability and comfort you need for a restful night's sleep. Perfect for those who crave a sturdy foundation, these mattresses offer the ideal blend of support and space, ensuring you wake up refreshed and ready to take on the day. With a variety of styles and materials to choose from, finding the perfect mattress to suit your needs has never been easier. Transform your bedroom into a haven of relaxation with our selection of firm back support king mattresses that cater to both comfort seekers and those in need of extra support.

Sort & Filter

Beautyrest PressureSmart 2.0 Firm 11" Mattress

Starting at

$1450⁹⁹

$2200⁹⁹

$750 OFF

Firm Comfort, best for

Back;Stomach Sleepers
Temperature;Bed Partner;Pain;Toss and Turn;Toss and Turn
Temperature
Bed Partner

FREE ADJUSTABLE BASE ³ up to $499 value with code ELEVATE (must add base to cart)

Sleepy's Basic Memory Foam Firm Mattress

2719

Starting at

$300⁷⁷

$1000⁹⁹

$700 OFF

Firm Comfort, best for

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

Sleepy's Basic Innerspring Firm Mattress

8317

Starting at

$300⁹⁹

Firm Comfort, best for

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

Sleepy's Rest Firm 2.0 Innerspring Mattress

6687

Starting at

$1800⁹⁹

Firm Comfort, best for

Back;Stomach Sleepers
Pain;Bed Partner;Temperature;Toss and Turn

Sleepy's Basic Foam Mattress

1332

Starting at

$250⁹⁹

Firm Comfort, best for

Back;Stomach Sleepers
Pain;Temperature;Bed Partner;Toss and Turn;Toss and Turn
Bed Partner

Beautyrest Greenwood 10.5" Firm Mattress

3332

Starting at

$520⁹⁹

$1300⁹⁹

$780 OFF

Firm Comfort, best for

Back;Stomach Sleepers
Pain;Toss and Turn;Temperature;Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ up to $499 value with code ELEVATE (must add base to cart)

Beautyrest Silver BRS900 11.75" Extra Firm Mattress

3051

Starting at

$1700⁹⁹

Extra Firm Comfort, best for

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

FREE ADJUSTABLE BASE ³ up to $499 value with code ELEVATE (must add base to cart)

Beautyrest BR800 11.25" Firm Mattress

2060

Starting at

$1300⁹⁹

Firm Comfort, best for

Back;Stomach Sleepers
Toss and Turn;Pain;Bed Partner;Temperature
Pain
Bed Partner

FREE ADJUSTABLE BASE ³ up to $499 value with code ELEVATE (must add base to cart)

Stearns & Foster Estate 14.5" Firm Mattress

1383

Starting at

$2699⁰⁰

$2999⁰⁰

$300 OFF

Firm Comfort, best for

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

Receive $300 Instant Gift⁴ with purchase.

Sealy Essentials Sudley 8.5" Firm Mattress

964

Starting at

$1000⁹⁹

Firm Comfort, best for

Back;Stomach Sleepers
Pain;Temperature;Bed Partner;Toss and Turn

Beautyrest Silver BRS900-C 13.75" Extra Firm Mattress

1638

Starting at

$2000⁹⁹

Extra Firm Comfort, best for

Back;Stomach Sleepers
Temperature;Pain;Bed Partner;Toss and Turn;Toss and Turn
Pain
Temperature

FREE ADJUSTABLE BASE ³ up to 499 value with code ELEVATE (must add base to cart)

Beautyrest Silver BRS900 11.75" Medium Firm Mattress

1616

Starting at

$1000⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ up to $499 value with code ELEVATE (must add base to cart)

Pressuresmart MF 12.5" Firm Mattress

217

Starting at

$2600⁹⁹

Firm Comfort, best for

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

FREE ADJUSTABLE BASE ³ up to $499 value with code ELEVATE (must add base to cart)

Sleepy's By Sealy Slumber Cushion Firm Mattress

249

Starting at

$2000⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ up to $499 value with code ELEVATE (must add base to cart)

Tulo Lavender 6" Firm Memory Foam Mattress

214

Starting at

$229⁹⁹

$400⁹⁹

$171 OFF

Firm Comfort, best for

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

Tulo Bamboo 6" Firm Green Tea Memory Foam Mattress

5277

Starting at

$730⁹⁹

Firm Comfort, best for

Back;Stomach Sleepers
Pain;Bed Partner;Temperature;Toss and Turn
Pain
Temperature

FREE ADJUSTABLE BASE ³ up to 499 value with code ELEVATE (must add base to cart)

Nectar Classic 12" Firm Memory Foam Mattress

161

Starting at

$849⁰⁰

$1399⁰⁰

$550 OFF

Firm Comfort, best for

Back;Stomach Sleepers
Pain;Bed Partner;Temperature;Toss and Turn
Bed Partner
Temperature

Serta Perfect Sleeper Elkins III 10" Firm Mattress

1549

Starting at

$1200⁹⁹

Firm Comfort, best for

Back;Stomach Sleepers
Pain;Temperature;Toss and Turn;Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ up to 499 value with code ELEVATE (must add base to cart)

Sealy Essentials Spruce 5.5" Firm Mattress

1366

Starting at

$500⁹⁹

$950⁹⁹

$450 OFF

Firm Comfort, best for

Back;Stomach Sleepers
Pain;Temperature;Bed Partner;Toss and Turn

Tulo 8" Firm Cooling Hybrid Mattress

Starting at

$900⁹⁹

Firm Comfort, best for

Back;Stomach Sleepers
Toss and Turn;Pain;Temperature;Bed Partner
Pain
Temperature

FREE ADJUSTABLE BASE ³ up to 499 value with code ELEVATE (must add base to cart)

Tempur-Pedic TEMPUR-ProAdapt 12" Firm Mattress

4306

Starting at

$3899⁰⁰

$4099⁰⁰

$200 OFF

Firm Comfort, best for

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

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

Sealy Posturepedic Plus Hybrid High Point 14" Firm Mattress

4246

Starting at

$1450⁷⁷

$2899⁰⁰

$1449 OFF

Firm Comfort, best for

Back;Stomach Sleepers
Bed Partner;Pain;Temperature;Toss and Turn;Toss and Turn
Bed Partner
Temperature

Beautyrest Black Series Three 15" Firm Mattress

1700

Starting at

$3899⁰⁰

$4499⁰⁰

$600 OFF

Firm Comfort, best for

Back;Stomach Sleepers
Pain;Bed Partner;Temperature;Toss and Turn;Toss and Turn
Bed Partner
Temperature

$300 ⁶ adjustable base instant gift with purchase.

Purple RestorePlus 13" Firm Hybrid Mattress

1659

Starting at

$3699⁰⁰

$3999⁰⁰

$300 OFF

Firm Comfort, best for

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

Beautyrest PressureSmart 2.0 Hybrid Firm 13" Mattress

1277

Starting at

$2050⁹⁹

Firm Comfort, best for

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

FREE ADJUSTABLE BASE ³ up to 499 value with code ELEVATE (must add base to cart)

Tempur-Pedic TEMPUR-LuxeAdapt 13" Firm Mattress

1272

Starting at

$5099⁰⁰

$5399⁰⁰

$300 OFF

Firm Comfort, best for

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

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

Firm Back Support King Mattresses

A king-size mattress with firm back support offers an inviting blend of spacious comfort and robust, reliable support, making it a top choice for couples, individuals who like to stretch out, or anyone who prioritizes their spinal alignment during sleep. The expansive dimensions of a king mattress create a luxurious sleep surface that feels indulgent, whether you’re sharing it with a partner, pets, or simply enjoy extra room to move freely throughout the night. Firm back support is especially valued by those who experience back discomfort, side or stomach sleepers seeking a stable surface, or anyone who prefers a mattress that doesn’t sink under their weight. During the late summer months, when heat and humidity can disrupt restful sleep, a firm mattress can help minimize excess body sinkage, promoting airflow around the body and contributing to a cooler, more comfortable night. In addition, the sturdy feel of a firm mattress can be a welcome relief after a long day spent on your feet or engaging in outdoor activities, providing a supportive foundation that encourages proper posture and helps muscles recover overnight.

When considering a firm back support king mattress, it’s important to think about the unique needs of the person or people who will be using it. For those with chronic back pain or athletes who demand extra support for muscle recovery, a mattress with mattress firm support can make a noticeable difference in daily comfort and long-term well-being. These mattresses are also a thoughtful gift for newlyweds setting up a home together, parents seeking a restful oasis, or anyone moving into a new space and looking to upgrade their sleep experience. The generous size is perfect for families who might have little ones or pets climbing in during the night, offering enough room for everyone without sacrificing support. As the seasons change from summer to fall, the importance of restorative sleep becomes even more pronounced, and investing in a mattress that delivers consistent, firm support can set the stage for better sleep hygiene and overall health. For those interested in exploring additional sizes while maintaining the same level of support, options such as Back Support Cal King Mattresses offer similar benefits in a slightly different dimension, ensuring there’s a supportive solution for every bedroom layout and preference.

Choosing the right firm king mattress is about more than just size or firmness—it’s about finding the right balance between comfort, support, and lifestyle needs. Many people discover that a firmer mattress helps reduce tossing and turning, allowing them to wake up feeling refreshed and ready to tackle the day. Whether you’re outfitting a master bedroom, guest suite, or searching for a mattress that will stand up to years of nightly use, prioritizing mattress firm support ensures that your investment pays dividends in nightly comfort and long-term durability. Picture sinking into crisp, cool sheets on a summer evening, the even surface of your mattress providing a reassuring sense of stability as you unwind and let go of the day’s stresses. For those who value both space and support, a firm back support king mattress becomes more than just a place to sleep—it’s a sanctuary for rest, recovery, and rejuvenation, season after season.