Cyber Monday Sale On California King Size Firm Mattresses

Shopping for a firm California King mattress this Cyber Monday? Explore options that pair a firmer feel with extra length for stretching out, then compare product details and prices to find a fit for your comfort preferences, bedroom and budget.

Sleepy's Rest Firm 2.0 Innerspring Mattress

7041

Starting at

$449⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Beautyrest BR800 11.25" Firm Mattress

2261

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

1867

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

Serta Perfect Sleeper Nurture Night 12" Firm Mattress

1237

Starting at

$999⁰⁰

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Nectar Classic 12" Firm Memory Foam Mattress

246

Starting at

$899⁰⁰

$1399⁰⁰

$500 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Tempur-Pedic TEMPUR-ProAdapt 2.0 12" Firm Mattress

5214

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

2316

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

Serta Perfect Sleeper Oasis Sleep 14.5" Firm Pillow Top Mattress

1235

Starting at

$1399⁰⁰

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Tempur-Pedic TEMPUR-LuxeAdapt 2.0 13" Firm Mattress

1500

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.

Sleepy's By Sealy Slumber Firm Mattress

722

Starting at

$1699⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Bed Partner
Toss and Turn
Pain
Temperature

Serta Perfect Sleeper Pacific Peace 12" Hybrid Firm Mattress

244

Starting at

$1399⁰⁰

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's By Sealy Memory Foam Firm Mattress

3334

Starting at

$479⁹⁹

$779⁹⁹

$300 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Toss and Turn

Stearns & Foster Estate 15" Firm Euro Pillow Top Mattress

2820

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-LuxeBreeze Firm 13" Mattress

1648

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.

Cyber Monday is a great opportunity to compare California King firm mattresses and find a fit for your space, comfort preferences and budget. A California King mattress measures 72 inches wide by 84 inches long, offering extra length for taller sleepers who want more room to stretch out. Compared with a standard king, it is four inches longer and four inches narrower, so measuring your bedroom and checking your bed frame dimensions are important steps before choosing. A firm California King mattress generally provides a less cushioned surface with less sink-in, which may appeal to back and stomach sleepers who prefer a more level feel. Still, firmness and support are not the same: Your body weight, sleep position and the mattress construction all influence how a mattress feels. As you explore Cyber Monday California King firm mattress options at Mattress Firm, consider how each design balances surface comfort with underlying support rather than choosing by firmness label alone. Finding the right California King size firm mattress also means comparing materials and practical details that affect everyday comfort. A firm hybrid mattress typically combines coils with foam or other comfort layers, while an all-foam design offers a different feel without a coil support system. Depending on their construction, these mattresses can vary in responsiveness, motion isolation, edge support and airflow. If you share your bed, consider how much you notice movement and whether you like a responsive surface or a more contouring feel. Before making a Cyber Monday mattress purchase, review the product dimensions, foundation requirements, delivery details and applicable return or exchange terms. Check whether your sheets fit both the California King dimensions and the mattress height, especially if you are choosing a thicker model. Mattress Firm’s Sleep Experts® can help you compare firmness preferences and mattress features so you can make an informed choice for your sleep needs.

What does a firm mattress feel like? + -

A firm mattress generally has a less plush surface with less initial sink than a softer mattress. It can still have cushioning, but the overall feel is more solid than deeply cradling.

Are mattress firmness ratings consistent across brands? + -

Firmness labels and rating scales can vary by brand. Read each mattress’s feel description rather than relying only on a firmness number or label.

What materials are used in firm mattresses? + -

Firm mattresses can feature memory foam, latex, innersprings or a hybrid construction that combines coils with cushioning layers. The materials, layer thicknesses and overall construction help shape the feel.

Can a firm mattress have a pillow top? + -

Yes. A pillow top adds a cushioning layer at the surface, while the layers beneath it can maintain an overall firm feel. Look for descriptions that distinguish surface plushness from overall firmness.

What details should I compare when browsing firm mattresses on Cyber Monday? + -

When browsing firm California King mattresses on Cyber Monday, compare construction, firmness descriptions, cushioning materials and cover details. Check whether each mattress has a smooth, quilted or pillow-top surface to better understand its texture and feel.