Cal King Systems

Explore Cal King Systems at Mattress Firm to find the right foundation for your California King bedroom setup. Compare available mattresses, bases and bedding to create a sleep space that fits your needs and preferences.

Sort & Filter

Sleepy's Signature TOTAL DEFENSE Mattress Protector

5687

Starting at

$129⁹⁹

Temperature
Allergies

Save $100 when you bundle¹⁰.

Sleepy's Deluxe Comfort Cool Mattress Protector

4179

Starting at

$179⁹⁹

Temperature
Allergies

Save $150 when you bundle¹⁰.

Sleepy's Signature Platform Frame

Starting at

$189⁹⁹

Sleepy's Basics Waterproof Mattress Protector

2492

Starting at

$69⁹⁹

Temperature
Allergies

Save $50 when you bundle¹⁰.

Tempur-Pedic TEMPUR-Ergo 3.0 Adjustable Base

3704

Starting at

$2299⁰⁰

$2399⁰⁰

$100 OFF

Sleepy's Deluxe Cool Stretch Sheet Set

Starting at

$179⁹⁹

Temperature
Allergies

Save $150 when you bundle¹⁰.

Tempur-Pedic TEMPUR-Protect Breeze Mattress Protector

802

Starting at

$309⁰⁰

Sleepy's Rest Firm 2.0 Innerspring Mattress

7001

Starting at

$449⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Serta Perfect Sleeper Sleep Excellence Medium PillowTop Mattress

1433

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-Ergo ProSmart Adjustable Base

Starting at

$3199⁰⁰

$3399⁰⁰

$200 OFF

Calm app 3-month free trial with mattress purchase & registration

Beautyrest BR800 13.5" Plush Pillow Top Mattress

2784

Starting at

$819⁹⁹

$1499⁹⁹

$680 OFF

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

3296

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

2233

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

1809

Starting at

$2799⁰⁰

$3099⁰⁰

$300 OFF

Firm Comfort, best for

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

Receive $300 Instant Gift⁴ with purchase.

Sleepy's 3" Gel Memory Foam Mattress Topper

396

Starting at

$189⁹⁹

$269⁹⁹

$80 OFF

Medium Comfort,

Temperature

Beautyrest BR800 13.5" Medium Pillow Top Mattress

1863

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

Sleepy's Elite Adjustable Base

1129

Starting at

$1699⁹⁹

Save $299 with qualifying mattress purchase. Code: ELEVATE

Beautyrest Silver BRS900-C 13.75" Extra Firm Mattress

1810

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

Bedgear Dri-Tec Mattress Protector

150

Starting at

$189⁹⁹

Temperature
Allergies

Beautyrest Silver BRS900 11.75" Medium Firm Mattress

1745

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

Purple Original Mattress

59743

Starting at

$1760⁰⁰

$2199⁰⁰

$439 OFF

Medium Comfort, best for

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

Bedgear Ver-Tex Performance Mattress Protector

162

Starting at

$299⁹⁹

Temperature

Sleepy's By Sealy Slumber Cushion Firm Mattress

301

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

548

Starting at

$779⁹⁹

$1459⁹⁹

$680 OFF

Plush Comfort, best for

Side Sleepers
Bed Partner
Pain
Temperature
Toss and Turn
Allergies

Beautyrest BR800 12" Plush Euro Top Mattress

735

Starting at

$569⁹⁹

$1399⁹⁹

$830 OFF

Plush Comfort, best for

Side Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

Bedgear StretchWick Mattress Protector

155

Starting at

$129⁹⁹

Temperature
Allergies

A California king system combines a spacious California king mattress with a compatible bed frame, foundation or adjustable base to create a complete sleep setup. Designed for taller sleepers and couples who want extra length, a California king mattress measures 72 inches wide by 84 inches long, offering generous room to stretch out without taking up the additional width of a standard king. Mattress Firm offers California king systems in a range of comfort levels and materials, including memory foam, innerspring and hybrid mattresses, so you can find the right balance of pressure relief, support and temperature regulation. Pair your mattress with a sturdy California king bed frame or foundation for reliable support, proper ventilation and a polished bedroom look. An adjustable California king system can add personalized comfort to your nightly routine with features such as independent head and foot elevation, multiple incline positions, massage settings and, on select models, sleep tracking or smart controls. A California king adjustable base is an excellent choice for couples who want more space and flexible positioning, while a split California king setup allows each sleeper to adjust their side independently. Before purchasing, confirm that the California king mattress, adjustable base, bed frame and bedding are all compatible, and look for features that match your sleep preferences and bedroom needs. With the right combination of mattress, base and accessories, a California king sleep system can help you create a supportive, comfortable space for better zzz's.

What is a California King system? + -

A California King system is a coordinated sleep setup that typically combines a mattress with a compatible foundation, adjustable base or bed frame. Choosing components designed to work together can help create a cohesive bedroom setup.

What components can be included in a California King system? + -

A system may include a mattress, foundation, adjustable base, bed frame, headboard and bedding. The exact combination depends on your sleep preferences and bedroom style.

Can I use an adjustable base with a California King mattress? + -

Many mattresses are designed to pair with adjustable bases, but compatibility can vary by mattress construction. Check the product details or ask a Sleep Expert® before combining components.

How do I choose a mattress for a California King system? + -

Consider your preferred feel, mattress materials, support style and whether you want features such as motion separation or an adjustable base. A Sleep Expert® can help you compare options based on how you sleep.

What bedding works with a California King system? + -

Look for fitted sheets, mattress protectors, comforters and duvet covers labeled for California King mattresses. Deep-pocket fitted sheets may be useful for mattresses with taller profiles.