Black Friday king mattresses

Explore Black Friday king mattresses for a spacious sleep setup that fits your bedroom and budget. Compare each option’s listed comfort and support features, dimensions and price to find a king-size mattress that suits your sleep preferences and available space.

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Sleepy's By Sealy Memory Foam Medium Mattress

3572

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 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

$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 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

$649⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Temperature
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

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 BR800 13.5" Plush Pillow Top Mattress

2808

Starting at

$1499⁹⁹

Plush Comfort, best for

Side Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Silver BRS900 11.75" Extra Firm Mattress

3335

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

2258

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

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

$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 12" Medium Plush Green Tea Memory Foam Mattress

5599

Starting at

$1019⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest BR800 13.5" Medium Pillow Top Mattress

1893

Starting at

$1499⁹⁹

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

$1999⁹⁹

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

$1099⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Tulo Bamboo 8" Medium Green Tea Memory Foam Mattress

5599

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

59808

Starting at

$2199⁰⁰

Medium Comfort, best for

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

Sleepy's By Sealy Slumber Cushion Firm Mattress

309

Starting at

$1999⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sealy Essentials Winter Green 13" Plush Euro Pillow Top Mattress

549

Starting at

$1459⁹⁹

Plush Comfort, best for

Side Sleepers
Bed Partner
Pain
Temperature
Toss and Turn
Allergies

Beautyrest BR800 12" Plush Euro Top Mattress

758

Starting at

$1399⁹⁹

Plush Comfort, best for

Side Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

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

1015

Starting at

$4699⁰⁰

Medium Comfort, best for

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

Receive $300 Instant Gift⁴ with purchase.

Sleepy's By Sealy Slumber Medium Mattress

196

Starting at

$2299⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sealy Essentials Winter Green 12" Medium Euro Top Mattress

604

Starting at

$1379⁹⁹

Medium Comfort, best for

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

Serta Perfect Sleeper Nurture Night 12" Firm Mattress

1229

Starting at

$999⁰⁰

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Explore Black Friday king mattresses with the comfort, support and space you want for your bedroom in mind. A standard king mattress measures 76 inches wide by 80 inches long, giving couples room to stretch out and making it a comfortable consideration for anyone who prefers a more spacious sleep surface. That extra width can be especially useful when two people have distinct sleeping habits or like to change positions throughout the night. Before choosing a size, measure your bedroom with nightstands, dressers and walking space accounted for, and check the path through doorways, hallways and stairs. A king mattress should fit your room as comfortably as it fits your sleep needs. Standard king and California King mattresses are not interchangeable: a California King measures 72 inches wide by 84 inches long, trading some width for added length. Matching your mattress dimensions to your frame, foundation and bedding helps you build a setup that works together from the start.

Comfort is another important way to compare Black Friday king mattresses, particularly when two people share the bed. Firmness describes how soft or firm a mattress feels, while support describes how well it helps maintain alignment; a softer feel does not automatically mean less support. Side sleepers may prefer cushioning around the shoulders and hips, while back and stomach sleepers may benefit from a feel that helps keep the midsection from sinking too deeply. Body weight and personal preference also influence how a mattress feels, so firmness labels are a starting point rather than a complete picture. Construction details can help you understand the experience a mattress is designed to provide. Foam comfort layers can contour to the body, while coil systems can contribute responsiveness and airflow. For partners, motion isolation is worth considering if movement on one side of the bed tends to disturb the other person. Edge support also matters when you sit along the perimeter or prefer sleeping closer to the side. If you tend to feel warm at night, compare temperature-related features alongside your bedding and bedroom environment.

Choosing a king mattress during Black Friday also means thinking beyond the sleep surface to the complete bedroom setup. Review the support requirements for any mattress you are considering, including whether your existing foundation or platform is compatible. If an adjustable base is part of your plan, confirm mattress compatibility rather than assuming every construction will work with it. A split king setup uses two Twin XL mattresses side by side to create the overall dimensions of a standard king, an arrangement that can be useful for partners who want independent positioning with compatible adjustable bases. Bedding needs deserve attention, too: mattress depth affects fitted-sheet fit, and a move to king size may mean replacing a protector, sheets and other essentials. As you compare Black Friday king mattresses at Mattress Firm, weigh overall value against the features that matter most to your nightly comfort. The right choice balances usable space, a supportive feel and practical compatibility, helping you create a bed that suits both your room and your everyday sleep routine.