Cyber Monday Sale On King Size Mattresses For Back Sleepers

Explore king size mattresses for back sleepers this Cyber Monday, comparing firmness and cushioning to find your preferred feel. Look for a balance of comfort and support that lets your shoulders and hips settle comfortably without allowing your midsection to sink too deeply.

Sleepy's By Sealy Memory Foam Medium Mattress

3572

Starting at

$589⁹⁹

$889⁹⁹

$300 OFF

Medium Comfort, best for

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

Sleepy's Basic Innerspring Firm Mattress

8752

Starting at

$249⁹⁹

Firm Comfort, best for

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

Serta Perfect Sleeper Charlotte 2.0 Medium Euro Top Mattress

2624

Starting at

$839⁹⁹

$1499⁹⁹

$660 OFF

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 Firm 2.0 Innerspring Mattress

7035

Starting at

$449⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Sleepy's Basic Foam Mattress

1428

Starting at

$259⁹⁹

$649⁹⁹

$390 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Temperature
Bed Partner
Toss and Turn

Serta Perfect Sleeper Sleep Excellence Medium PillowTop Mattress

1466

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

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

3705

Starting at

$2029⁷⁷

$2899⁰⁰

$869 OFF

Medium Comfort, best for

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

Beautyrest Silver BRS900 11.75" Extra Firm Mattress

3335

Starting at

$709⁹⁹

$1699⁹⁹

$990 OFF

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

2258

Starting at

$619⁹⁹

$1299⁹⁹

$680 OFF

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

1862

Starting at

$3099⁰⁰

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

$499⁷⁷

$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

5599

Starting at

$379⁹⁹

$889⁹⁹

$510 OFF

Medium Comfort, best for

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

Tulo Bamboo 12" Medium Plush Green Tea Memory Foam Mattress

5599

Starting at

$429⁹⁹

$1019⁹⁹

$590 OFF

Medium Comfort, best for

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

Beautyrest BR800 13.5" Medium Pillow Top Mattress

1893

Starting at

$819⁹⁹

$1499⁹⁹

$680 OFF

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Silver BRS900-C 13.75" Extra Firm Mattress

1845

Starting at

$859⁹⁹

$1999⁹⁹

$1140 OFF

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

1768

Starting at

$809⁹⁹

$1099⁹⁹

$290 OFF

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

A king size mattress gives back sleepers room to stretch out, but the right balance of cushioning and support matters just as much as extra space. For many people who sleep on their backs, a medium-firm mattress is a useful starting point: it can cushion the shoulders and hips while helping keep the pelvis from sinking too deeply. Your ideal firmness depends on your body weight, comfort preferences and whether you change positions during the night. A memory foam king mattress can offer close contouring, while a hybrid king mattress combines comfort layers with a coil support system. Some models also feature zoned support designed to provide a firmer feel beneath specific areas of the body. As you explore Cyber Monday king size mattresses for back sleepers, compare how each mattress supports your lower back without creating uncomfortable pressure. A firmer surface is not automatically a better fit, especially if it leaves you feeling insufficiently cushioned. Choosing a king mattress for back sleeping also means considering your bedroom, sleep partner and nightly comfort needs. A standard king mattress measures 76 inches wide by 80 inches long, offering generous width for two sleepers. Measure your room and delivery path, and confirm that your bed frame or foundation meets the mattress manufacturer’s support requirements. If you share your bed, look for motion isolation to help limit movement transfer and edge support that makes the perimeter feel more stable. For those who tend to feel warm overnight, compare breathable covers, airflow-focused construction and temperature-regulating materials rather than relying on firmness alone. Cyber Monday mattress shopping is also an opportunity to review trial terms, warranty coverage and delivery options before choosing. Explore king size mattresses at Mattress Firm with your preferred feel, support needs and budget in mind, then pair your selection with a pillow height that keeps your head and neck comfortably aligned.

What mattress construction terms should back sleepers know when browsing on Cyber Monday? + -

Foam mattresses use foam layers throughout, while innerspring mattresses use a coil-based core with cushioning above it. Hybrid mattresses combine a coil core with substantial foam or latex comfort layers. These terms describe construction rather than a specific firmness level.

What does a mattress firmness label describe? + -

Firmness describes how soft or firm a mattress feels at the surface. Common labels include plush, medium and firm, though rating scales vary by brand. Back sleepers can use these labels to organize their research around personal feel preferences.

What is the difference between a pillow top and a Euro top? + -

A pillow top has an added cushioning layer with a visible separation from the mattress below. A Euro top is sewn flush with the mattress edges for a more uniform appearance. Neither term alone tells you the mattress's overall firmness.

How do quilted and smooth mattress covers differ? + -

Quilted covers feature stitching that joins the outer fabric to underlying padding, creating a textured surface. Smooth covers have little or no visible quilting for a more streamlined finish. Fabric and padding vary, so check the material descriptions when comparing them.

What details should back sleepers record when researching mattresses on Cyber Monday? + -

Create a shortlist with each mattress's construction, stated firmness, comfort-layer materials and top style. Note whether the cover is removable and what care instructions apply. Keeping the same categories for each mattress makes product descriptions easier to compare.