King Soft Knit Cover Mattresses

Find comfort that fits your space with King Soft Knit Cover Mattresses from Mattress Firm. Explore a range of king-size options to help you create a sleep setup that suits your bedroom and routine, with choices available at different price points and preferences.

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Tulo Bamboo 10" Medium Green Tea Memory Foam Mattress

5567

Starting at

$379⁹⁹

$889⁹⁹

$510 OFF

Medium Comfort, best for

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

Tulo Bamboo 12" Medium Plush Green Tea Memory Foam Mattress

5567

Starting at

$429⁹⁹

$1019⁹⁹

$590 OFF

Medium Comfort, best for

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

Tulo Bamboo 8" Medium Green Tea Memory Foam Mattress

5567

Starting at

$329⁹⁹

$809⁹⁹

$480 OFF

Medium Comfort, best for

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

Serta Perfect Sleeper Elkins III 11" Plush Euro Top Mattress

1610

Starting at

$600⁰⁰

$1199⁹⁹

$600 OFF

Plush Comfort, best for

Side Sleepers
Pain
Temperature
Toss and Turn
Bed Partner

FREE ADJUSTABLE BASE ³ with code ELEVATE

Nectar Premier 13" Medium Memory Foam Mattress

499

Starting at

$1099⁰⁰

$1799⁰⁰

$700 OFF

Medium Comfort, best for

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

Tulo Gel Memory Foam Zoned Support Mattress Topper

122

Starting at

$80⁹⁹

$119⁹⁹

$39 OFF

Medium Comfort,

Temperature

Beautyrest Black Series Two 16.25" Plush Pillow Top Mattress

294

Starting at

$3699⁰⁰

$4099⁰⁰

$400 OFF

Plush Comfort, best for

Side Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Beautyrest Black Series Two 16.5" Medium Pillow Top Mattress

295

Starting at

$3699⁰⁰

$4099⁰⁰

$400 OFF

Medium Comfort, best for

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

$300 ⁶ adjustable base instant gift with purchase.

Tempur-Pedic TEMPUR-Adapt 2.0 11" Medium Mattress

3669

Starting at

$2799⁰⁰

$2999⁰⁰

$200 OFF

Medium Comfort, best for

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

Receive $300 Instant Gift⁴ with purchase + Calm app 3-month free trial

Tempur-Pedic TEMPUR-ProAdapt 2.0 12" Soft Mattress

3502

Starting at

$3799⁰⁰

$4199⁰⁰

$400 OFF

Plush Comfort, best for

Side Sleepers
Pain
Allergies
Bed Partner
Toss and Turn
Temperature

Receive $300 Instant Gift⁴ with purchase + Calm app 3-month free trial

Purple Restore 11.5" Soft Hybrid Mattress

1666

Starting at

$2700⁰⁰

$3399⁰⁰

$699 OFF

Plush Comfort, best for

Side Sleepers
Pain
Allergies
Bed Partner
Toss and Turn
Temperature

Tempur-Pedic TEMPUR-LuxeAdapt 2.0 13" Soft Mattress

1531

Starting at

$5099⁰⁰

$5599⁰⁰

$500 OFF

Plush Comfort, best for

Side Sleepers
Pain
Allergies
Bed Partner
Toss and Turn
Temperature

Receive $300 Instant Gift⁴ with purchase + Calm app 3-month free trial

Purple RestorePlus Cool Touch 13" Hybrid Mattress

1005

Starting at

$3900⁰⁰

$4699⁰⁰

$799 OFF

Medium Comfort, best for

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

$300 ^◇ adjustable base instant gift with purchase.

Purple RestorePremier Cool Touch 13" Hybrid Mattress

856

Starting at

$4700⁰⁰

$5499⁰⁰

$799 OFF

Medium Comfort, best for

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

$300 ^◇ adjustable base instant gift with purchase.

Purple Restore Cool Touch 11.5" Hybrid Mattress

790

Starting at

$3000⁰⁰

$3699⁰⁰

$699 OFF

Medium Comfort, best for

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

$300 ^◇ adjustable base instant gift with purchase.

Beautyrest BR800 Greenwood 11.5" Medium Firm Mattress

3228

Starting at

$1299⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest BR800 11.5" Medium Firm Mattress

3152

Starting at

$589⁹⁹

$1299⁹⁹

$710 OFF

Medium Comfort, best for

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

Sleepy's By Sealy Skye Hybrid Mattress

2355

Starting at

$699⁹⁹

$999⁹⁹

$300 OFF

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

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

2050

Starting at

$3429⁷⁷

$4899⁰⁰

$1469 OFF

Plush Comfort, best for

Side Sleepers
Bed Partner
Pain
Temperature
Toss and Turn

Tempur-Pedic TEMPUR-LuxeBreeze Soft 13" Mattress

1560

Starting at

$9598⁰⁰

$10598⁰⁰

$1000 OFF

Plush Comfort, best for

Side Sleepers
Pain
Bed Partner
Temperature
Allergies
Toss and Turn

Receive $300 Instant Gift⁴ with purchase + Calm app 3-month free trial

Purple RestorePremier 13" Soft Hybrid Mattress

758

Starting at

$4400⁰⁰

$5199⁰⁰

$799 OFF

Plush Comfort, best for

Side Sleepers
Pain
Temperature
Allergies
Bed Partner
Toss and Turn

Beautyrest BR800 Greenwood 12" Plush Euro Top Mattress

742

Starting at

$1399⁹⁹

Plush Comfort, best for

Side Sleepers
Bed Partner
Toss and Turn
Temperature
Pain

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sealy Posturepedic Elite Hybrid High Point II 14" Soft Mattress

544

Starting at

$2799⁰⁰

$3099⁰⁰

$300 OFF

Plush Comfort, best for

Side Sleepers
Pain
Temperature
Allergies
Bed Partner
Toss and Turn

Receive $200 Instant Gift⁴ with purchase.

Beautyrest Black Series Two 14.25" Firm Mattress

358

Starting at

$3499⁰⁰

$3899⁰⁰

$400 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Kingsdown Crown Imperial 16" Plush Euro Top Mattress

172

Starting at

$5299⁰⁰

$6899⁰⁰

$1600 OFF

Plush Comfort, best for

Side Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Kingsdown Crown Imperial 16" Firm Euro Top Mattress

127

Starting at

$5299⁰⁰

$6899⁰⁰

$1600 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

A king soft knit cover mattress combines spacious comfort with a smooth, cozy sleep surface designed to feel soft against the skin. With a standard king size measuring approximately 76 inches wide by 80 inches long, a king mattress gives couples room to stretch out while providing ample space for individual sleep positions. The flexible knit construction can help the cover move with the mattress layers, creating a comfortable feel that complements memory foam, innerspring and hybrid designs. Whether you prefer a plush king mattress, a medium-feel king mattress or a firmer sleep surface, choosing a mattress with a soft knit cover can add an inviting layer of comfort to your bedroom. Explore king soft knit cover mattresses in a range of materials, comfort levels and support systems to find the right match for your sleep style. Look for features such as pressure-relieving foam, individually wrapped coils, reinforced edge support and breathable materials based on your needs. Couples may appreciate a king mattress with motion isolation, while hot sleepers can consider designs that promote airflow through the cover and comfort layers. Sleep Experts® can help you compare king mattresses, understand the benefits of different constructions and choose bedding that fits your new sleep setup. With the right foundation, sheets and pillows, a soft knit cover king mattress can help make sleep easy™.

What is a soft knit cover mattress? + -

A soft knit cover mattress features a flexible, fabric cover designed to provide a smooth, comfortable surface. The cover may be paired with comfort layers made from materials such as memory foam, latex or gel foam.

What does a soft knit mattress cover feel like? + -

Soft knit covers typically feel smooth, flexible and comfortable against bedding. Their stretchable construction can contour to the mattress layers while maintaining a gentle surface feel.

What materials are used in soft knit mattress covers? + -

Soft knit mattress covers may be made with polyester, cotton, rayon or blended fabrics. Some designs also include specialty fibers or quilted layers for added texture and cushioning.

How does a soft knit cover affect a mattress? + -

A soft knit cover adds a comfortable fabric layer over the mattress and can complement the feel of the layers underneath. Its flexible construction allows the surface to move with the mattress rather than creating a firm, rigid barrier.

How should you care for a mattress with a soft knit cover? + -

Use a properly fitted mattress protector to help keep the cover clean, and follow the care instructions provided with the mattress. Avoid removing or washing the cover unless it is specifically designed for that purpose.