Ultra-Comfort Modern King Size Mattress

Explore the Ultra-Comfort Modern King Size Mattress collection to find a stylish, spacious option for your bedroom. With a range of king size mattresses available, you can compare designs, materials and comfort preferences to find the right fit for your sleep space.

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Beautyrest Silver BRS900 11.75" Extra Firm Mattress

3296

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 Silver BRS900-C 13.75" Extra Firm Mattress

1810

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 Black Series One 13.5" Extra Firm Mattress

697

Starting at

$2499⁰⁰

$2899⁰⁰

$400 OFF

Extra Firm Comfort, best for

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

$300 ⁶ adjustable base instant gift with purchase.

Beauty Sleep® Midnight Dream II 14.25" Ultra Plush Pillow Top Mattress

664

Starting at

$779⁹⁹

$1499⁹⁹

$720 OFF

Ultra Plush Comfort, best for

Side Sleepers
Toss and Turn
Bed Partner
Temperature
Pain

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beauty Sleep® Midnight Dream 14.25" Ultra Plush Pillow Top Mattress

576

Starting at

$779⁹⁹

$1499⁹⁹

$720 OFF

Ultra Plush Comfort, best for

Side Sleepers
Toss and Turn
Bed Partner
Temperature
Pain

FREE ADJUSTABLE BASE ³ with code ELEVATE

Serta Perfect Sleeper Oasis Sleep 12" Extra Firm Mattress

905

Starting at

$1399⁰⁰

Extra 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 Extra Firm Mattress

955

Starting at

$1449⁹⁹

$1999⁹⁹

$550 OFF

Extra Firm Comfort, best for

Back, Stomach Sleepers
Pain
Toss and Turn
Temperature
Bed Partner

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest PressureSmart 2.0 Extra Firm 13.5" Mattress

2187

Starting at

$1449⁹⁹

$2899⁹⁹

$1450 OFF

Extra Firm Comfort, best for

Back, Stomach Sleepers
Temperature
Bed Partner
Pain
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Stearns & Foster Estate 13.5" Extra Firm Mattress

1058

Starting at

$2799⁰⁰

$3099⁰⁰

$300 OFF

Extra Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

Receive $300 Instant Gift⁴ with purchase.

Stearns & Foster Lux Estate 13.5" Extra Firm Mattress

897

Starting at

$3299⁰⁰

$3899⁰⁰

$600 OFF

Extra Firm Comfort, best for

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

Receive $300 Instant Gift⁴ with purchase.

Dreamcloud PressureSmart Technology Extra Firm Pillow Top Mattress

270

Starting at

$2649⁰⁰

Extra Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sealy Posturepedic Plus Norman II 13" Ultra Firm Mattress

Starting at

$1899⁰⁰

Extra Firm Comfort, best for

Back Sleepers
Pain
Allergies
Bed Partner
Toss and Turn

Receive $200 Instant Gift⁴ with purchase.

Sealy Posturepedic Elite Brenham II 14" Ultra Firm Mattress

Starting at

$2399⁰⁰

$2599⁰⁰

$200 OFF

Extra Firm Comfort, best for

Back Sleepers
Pain
Temperature
Allergies
Bed Partner
Toss and Turn

Receive $200 Instant Gift⁴ with purchase.

Kingsdown Wesley 15" Extra Firm Mattress

Starting at

$4199⁰⁰

$4799⁰⁰

$600 OFF

Extra Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

An ultra-comfort modern king size mattress combines spacious support with contemporary sleep technology to help you relax from evening through morning. With extra room for couples, families and pets, a king mattress can make it easier to stretch out without disturbing your partner. Look for comfort layers made with pressure-relieving memory foam, responsive foam or cooling materials that cushion the shoulders and hips while supporting proper spinal alignment. A modern king mattress may also feature individually wrapped coils for targeted support, reduced motion transfer and improved airflow, creating a comfortable sleep surface for back, side and combination sleepers. Choosing the right ultra-comfort king size mattress starts with considering your preferred firmness, sleeping position and temperature needs. Plush mattresses can provide a softer, more cushioned feel, while medium and firm mattresses may offer a balanced combination of contouring comfort and dependable support. Cooling covers, breathable foams and supportive coil systems can help promote a more comfortable sleep environment throughout the night. Explore king mattresses at Mattress Firm to compare mattress types, comfort levels and trusted brands, then complete your bedroom with a compatible king bed frame, adjustable base and comfortable bedding for an elevated modern sleep setup.

What features define an ultra-comfort modern mattress? + -

Ultra-comfort modern mattresses often combine pressure-relieving comfort layers, supportive core materials and breathable upholstery for a balanced sleep surface. Contemporary designs may also include cooling fabrics, zoned support or responsive foam.

Which mattress materials are commonly used for ultra-comfort designs? + -

Common materials include memory foam, latex, individually wrapped coils and quilted fabric covers. Each material offers a different feel, from contouring and pressure relief to responsive support and airflow.

How do I choose the right firmness for an ultra-comfort mattress? + -

Consider your preferred sleep feel, sleeping position and the amount of support you enjoy. Side sleepers often prefer a more cushioning surface, while back and stomach sleepers may favor a firmer, more supportive feel.

Are ultra-comfort modern mattresses available with cooling features? + -

Many modern mattresses include breathable covers, ventilated foam, gel-infused comfort layers or coil systems designed to encourage airflow. Look for the features that best match your personal comfort preferences.

How can I care for an ultra-comfort modern mattress? + -

Use a supportive foundation, rotate the mattress according to the manufacturer's recommendations and protect the surface with a breathable mattress protector. Regularly washing bedding and checking the foundation can also help maintain a fresh sleep environment.