Black Friday Sale On King Size Firm Mattresses

Shopping for a king-size firm mattress this Black Friday? Browse options that pair a spacious sleep surface with a firmer feel, then compare product details and prices to find a mattress that fits your comfort preferences and budget.

Sleepy's Basic Innerspring Firm Mattress

8758

Starting at

$249⁹⁹

Firm Comfort, best for

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

Sleepy's Rest Firm 2.0 Innerspring Mattress

7039

Starting at

$449⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Stearns & Foster Estate 14.5" Firm Mattress

1865

Starting at

$2899⁰⁰

$3099⁰⁰

$200 OFF

Firm Comfort, best for

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

$300 Instant Gift⁴ with purchase of a mattress set.

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 6" Firm Green Tea Memory Foam Mattress

5604

Starting at

$259⁹⁹

$729⁹⁹

$470 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Nectar Classic 12" Firm Memory Foam Mattress

245

Starting at

$899⁰⁰

$1399⁰⁰

$500 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Sealy Essentials Spruce 5.5" Firm Mattress

1373

Starting at

$549⁹⁹

$949⁹⁹

$400 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Temperature
Bed Partner
Toss and Turn

Tempur-Pedic TEMPUR-ProAdapt 2.0 12" Firm Mattress

5191

Starting at

$3999⁰⁰

$4199⁰⁰

$200 OFF

Firm Comfort, best for

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

$300 Instant Gift⁴ with purchase of a mattress set + Calm app 3-month free trial.

Beautyrest Black Series Three 15" Firm Mattress

2312

Starting at

$4199⁰⁰

$4799⁰⁰

$600 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Purple RestorePlus 13" Firm Hybrid Mattress

1668

Starting at

$3999⁰⁰

$4399⁰⁰

$400 OFF

Firm Comfort, best for

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

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

6825

Starting at

$2869⁷⁷

$4099⁰⁰

$1229 OFF

Firm Comfort, best for

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

Tempur-Pedic TEMPUR-LuxeAdapt 2.0 13" Firm Mattress

1498

Starting at

$5299⁰⁰

$5599⁰⁰

$300 OFF

Firm Comfort, best for

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

$300 Instant Gift⁴ with purchase of a mattress set + Calm app 3-month free trial.

Beautyrest BR800 Greenwood 10.5" Firm Mattress

3413

Starting at

$569⁹⁹

$1299⁹⁹

$730 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Bed Partner
Toss and Turn
Temperature
Pain

Stearns & Foster Estate 15" Firm Euro Pillow Top Mattress

2818

Starting at

$3099⁰⁰

$3299⁰⁰

$200 OFF

Firm Comfort, best for

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

$300 Instant Gift⁴ with purchase of a mattress set.

Tempur-Pedic TEMPUR-LuxeAdapt 13" Firm Previous Generation Mattress

1916

Starting at

$3429⁷⁷

$4899⁰⁰

$1469 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Bed Partner
Pain
Temperature
Toss and Turn

Tempur-Pedic TEMPUR-LuxeBreeze Firm 13" Mattress

1640

Starting at

$6299⁰⁰

$6599⁰⁰

$300 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 Instant Gift⁴ with purchase of a mattress set + Calm app 3-month free trial.

Black Friday is a good time to compare king size firm mattresses and find a sleep surface that fits your comfort preferences, bedroom and budget. A standard king mattress measures 76 inches wide by 80 inches long, giving couples room to spread out and solo sleepers extra space to settle in. A firm king mattress generally has a less plush feel than a medium or soft model, but firmness and support are not the same thing: firmness describes how the surface feels, while support helps keep your body comfortably aligned. Back and stomach sleepers may prefer a firmer surface that limits sinking around the hips, while side sleepers may need more cushioning at the shoulders and hips. Body weight and personal preference also affect how firm a mattress feels. As you explore king size firm mattresses for Black Friday, compare the comfort layers as well as the support system rather than relying on the firmness label alone. Choosing between a firm memory foam mattress, an innerspring mattress and a firm hybrid mattress can help narrow your Black Friday search. Memory foam typically contours to the body and can help reduce motion transfer, while innerspring designs often offer a more responsive feel. Hybrid mattresses combine coils with foam or other comfort materials, with cushioning and responsiveness varying by model. For couples, edge support and motion isolation are useful features to evaluate, especially if one person changes positions frequently. If you tend to sleep warm, compare breathable covers and airflow-focused construction without assuming that every firm mattress sleeps cooler. Before choosing a king size mattress, measure your room, doorways and stairways, and confirm that your bed frame or foundation meets the mattress manufacturer’s requirements. Review the delivery details, warranty and any applicable sleep trial or return terms, too. Mattress Firm’s Sleep Experts® can help you compare firm mattress options and understand which features matter most for your sleep preferences.

What does firm mean in a mattress description? + -

Firm describes a mattress with a sturdier, less cushioned surface feel. Firmness ratings vary by brand, so compare each brand’s firmness scale and construction details rather than relying on the label alone.

How do firm foam and firm hybrid mattresses differ? + -

Firm foam mattresses use foam layers throughout, while firm hybrid mattresses combine foam or other cushioning materials with a coil system. Their surface feel depends on the materials, layer thicknesses and overall construction.

Can a firm mattress have a pillow top? + -

Yes. A pillow top adds a distinct cushioning layer to the surface, while the mattress beneath it can still have a firm overall feel. Check both the firmness description and the top construction when comparing options.

What details should I compare when browsing firm mattresses on Black Friday? + -

Compare firmness descriptions, foam or coil construction, cushioning layers and cover materials. Looking at the same details across mattresses makes it easier to understand how their designs differ.

How do I care for a firm mattress? + -

Follow the manufacturer’s care instructions, including guidance on cleaning and rotation. Use a mattress protector, follow the care label when cleaning spills and flip the mattress only if it is designed to be flipped.