Best King Size Memory Foam Mattress of 2026

Find the best king size memory foam mattress for your sleep style, comfort preferences and budget. This list is ranked by user review ratings to help you compare highly rated options, with guidance on pressure relief, motion isolation, support and materials. Explore the top-rated choices to find a king mattress that makes sleep easy™

What to look for in the best king size memory foam mattress

The best king size memory foam mattress can provide spacious comfort and pressure-relieving support, but the right choice depends on your sleep preferences and needs.

1. Firmness And Support

Choose a firmness level that supports your preferred sleep position and keeps your spine comfortably aligned. Side sleepers may prefer a softer feel for pressure relief, while back and stomach sleepers often benefit from firmer support.

2. Pressure Relief

Memory foam contours to your body to help cushion pressure points around your shoulders, hips and back. Look for a mattress with comfort layers that balance contouring with enough support to make moving and changing positions easier.

3. Temperature Regulation

Some memory foam mattresses can retain heat, so consider designs with breathable covers, ventilated foam or cooling materials. These features may help promote a more comfortable sleep temperature throughout the night.

4. Motion Isolation And Size

A king size mattress gives couples plenty of room to spread out, while memory foam can help reduce motion transfer across the sleep surface. Before choosing a mattress, measure your bedroom and confirm that your bed frame can support a standard king size.

Beautyrest BR800 11.25" Firm Mattress

A king-size firm mattress with Beautyrest Pocketed Coil springs and Gel Memory Foam Lumbar Support.

2242

Firm Comfort, best for

Back, Stomach Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

Starting at

$1299⁹⁹

FREE ADJUSTABLE BASE ³ with code ELEVATE

Stearns & Foster Estate 14.5" Firm Mattress

A luxurious, firm king-size mattress with motion separation, pressure relief, and a cool-to-the-touch cover.

1829

Firm Comfort, best for

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

Starting at

$2799⁰⁰

$3099⁰⁰

$300 OFF

Receive $300 Instant Gift⁴ with purchase.

Nectar Premier 13" Medium Memory Foam Mattress

A medium-firm king-sized memory foam mattress with enhanced cooling and pressure relief for restful sleep.

510

Medium Comfort, best for

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

Starting at

$1099⁰⁰

$1799⁰⁰

$700 OFF

Tulo Gel Memory Foam Zoned Support Mattress Topper

A cooling gel memory foam topper with zoned support for optimal temperature and responsive comfort.

122

Medium Comfort, best for

Temperature

Starting at

$107⁹⁹

$159⁹⁹

$52 OFF

Stearns & Foster Studio 14" Medium Mattress

A handcrafted, medium comfort mattress with premium memory foam and encased innersprings for pressure relief and cooler sleep.

1387

Medium Comfort, best for

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

Starting at

$2199⁰⁰

$2499⁰⁰

$300 OFF

Beautyrest Silver BRS900-C 14.5" Medium Mattress

A breathable silver king mattress with medium firmness, pressure relief, and adjustable base compatibility.

797

Medium Comfort, best for

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

Starting at

$1999⁹⁹

FREE ADJUSTABLE BASE ³ with code ELEVATE

Stearns & Foster Lux Estate 14.5" Medium Mattress

A medium comfort mattress with motion separation, pressure relief, and breathable memory foam material.

733

Medium Comfort, best for

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

Starting at

$3299⁰⁰

$3899⁰⁰

$600 OFF

Receive $300 Instant Gift⁴ with purchase.

Stearns & Foster Estate 14.5" Plush Mattress

A luxurious plush mattress with TEMPUR Indulge Memory Foam and an exclusive innerspring system for pressure relief and cooling.

1079

Plush Comfort, best for

Side Sleepers
Pain
Bed Partner
Temperature
Allergies
Toss and Turn

Starting at

$2799⁰⁰

$3099⁰⁰

$300 OFF

Receive $300 Instant Gift⁴ with purchase.

Sierra Sleep By Ashley Chime 12" Memory Foam Mattress

A plush memory foam mattress with pressure relief and motion isolation, ideal for side sleepers seeking comfort.

468

Plush Comfort, best for

Side Sleepers
Pain
Bed Partner
Toss and Turn

Starting at

$574⁹⁹

$1574⁹⁹

$1000 OFF

Sleepy's 3" Gel Memory Foam Mattress Topper

A cool to the touch memory foam mattress topper with body hugging support and antimicrobial treatment.

398

Medium Comfort, best for

Temperature

Starting at

$269⁹⁹

What is a memory foam mattress made of? + -

A memory foam mattress typically includes a comfort layer made from viscoelastic foam, one or more transition layers and a supportive base foam layer. Some models also include cooling covers, gel-infused foam, breathable materials or other specialized components.

What firmness options are available for memory foam mattresses? + -

Memory foam mattresses are available in soft, medium and firm feels, with some models offering a medium-firm feel. The right option depends on your preferred comfort, sleep position and how much support you want from the mattress.

Do memory foam mattresses have different cover materials? + -

Yes. Covers may be made with materials such as polyester, cotton, rayon or a blend of performance fibers. Some covers are removable and washable, while others are designed to remain on the mattress for regular use.

Can you use a memory foam mattress on an adjustable base? + -

Many memory foam mattresses are compatible with adjustable bases, but compatibility varies by model. Check the mattress specifications and the adjustable base requirements before pairing them together.

How should you care for a memory foam mattress? + -

Use a mattress protector, rotate the mattress if the manufacturer recommends it and keep the cover clean according to its care instructions. Avoid bending, folding or removing the mattress cover unless the manufacturer specifically allows it.