Side Sleeper King Mattresses

Shop Side Sleeper King Mattresses at Mattress Firm to explore king-size options for shoppers who prefer sleeping on their side. Browse a variety of mattress choices and find the right fit for your bedroom, sleep style and budget.

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Serta Perfect Sleeper Nurture Night 13.5" Medium Mattress

1026

Starting at

$1099⁰⁰

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest PressureSmart 2.0 Hybrid Medium 13" Mattress

1758

Starting at

$1475⁰⁰

$2949⁹⁹

$1475 OFF

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest BR800 13.5" Medium Pillow Top Mattress

1873

Starting at

$1499⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest BR800 12" Plush Euro Top Mattress

745

Starting at

$1399⁹⁹

Plush Comfort, best for

Side Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Serta Perfect Sleeper Nurture Night 13.5" Plush Mattress

922

Starting at

$1099⁰⁰

Plush Comfort, best for

Side Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest PressureSmart 2.0 Plush Pillow Top 13.75" Mattress

2696

Starting at

$1200⁰⁰

$2399⁹⁹

$1200 OFF

Plush Comfort, best for

Side Sleepers
Temperature
Bed Partner
Pain
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Silver BRS900 11.75" Medium Firm Mattress

1753

Starting at

$1099⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sealy Essentials Winter Green 13" Plush Euro Pillow Top Mattress

549

Starting at

$1459⁹⁹

Plush Comfort, best for

Side Sleepers
Bed Partner
Pain
Temperature
Toss and Turn
Allergies

Stearns & Foster Lux Estate Elite 16" Medium Euro Pillow Top Mattress

985

Starting at

$4099⁰⁰

$4699⁰⁰

$600 OFF

Medium Comfort, best for

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

Receive $300 Instant Gift⁴ with purchase.

Serta Perfect Sleeper Nurture Night 14.5" Pillow Top Mattress

1137

Starting at

$1249⁰⁰

Plush Comfort, best for

Side Sleepers
Pain
Temperature
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Black Series Three 16.75" Plush Pillow Top Mattress

1471

Starting at

$4599⁰⁰

$5199⁰⁰

$600 OFF

Plush Comfort, best for

Side Sleepers
Bed Partner
Pain
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Beautyrest Silver BRS900-C 14.5" Medium Mattress

797

Starting at

$1999⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's By Sealy Spring Plush Mattress

827

Starting at

$1599⁹⁹

$2049⁹⁹

$450 OFF

Plush Comfort, best for

Side Sleepers
Pain
Bed Partner
Toss and Turn
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Dreamcloud PressureSmart Technology Plush Mattress

616

Starting at

$2149⁰⁰

Plush Comfort, best for

Side Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beauty Sleep® Midnight Dream 14.25" Medium Pillow Top Mattress

379

Starting at

$779⁹⁹

$1499⁹⁹

$720 OFF

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's By Sealy Memory Foam Medium Mattress

3511

Starting at

$889⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest PressureSmart 2.0 Plush 11.75" Mattress

6252

Starting at

$1150⁰⁰

$2299⁹⁹

$1150 OFF

Plush Comfort, best for

Side Sleepers
Temperature
Bed Partner
Pain
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's By Sealy Memory Foam Plush Mattress

2797

Starting at

$999⁹⁹

Plush Comfort, best for

Side Sleepers
Pain
Bed Partner
Toss and Turn
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Serta Perfect Sleeper Charlotte 2.0 Medium Euro Top Mattress

2621

Starting at

$1499⁹⁹

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-Adapt 11" Medium Previous Generation Mattress

3652

Starting at

$2029⁷⁷

$2899⁰⁰

$869 OFF

Medium Comfort, best for

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

Beautyrest BR800 13.5" Plush Pillow Top Mattress

2795

Starting at

$1499⁹⁹

Plush Comfort, best for

Side Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Tulo Bamboo 10" Medium Green Tea Memory Foam Mattress

5567

Starting at

$889⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's By Sealy Slumber Cushion Firm Mattress

303

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 12" Medium Euro Top Mattress

604

Starting at

$1379⁹⁹

Medium Comfort, best for

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

Beautyrest Silver BRS900 12" Plush Mattress

1149

Starting at

$1699⁹⁹

Plush Comfort, best for

Side Sleepers
Temperature
Pain
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

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

A side sleeper king mattress should combine pressure relief with reliable support to help keep your spine aligned from shoulders to hips. Side sleepers often benefit from a comfort layer that cushions wider pressure points, such as the shoulders, hips and knees, without allowing the body to sink too deeply. Memory foam, TEMPUR-Material™ and plush pillow-top mattresses can provide responsive contouring, while a supportive hybrid mattress pairs conforming foam with individually wrapped coils for added stability and airflow. Choosing the right mattress firmness depends on body type and personal preference, but a medium to medium-firm king mattress is a comfortable starting point for many side sleepers who want a balance of cushioning and support. King size mattresses offer generous space for couples, making them a popular choice for side sleepers who change positions or need more room to stretch out. Look for a mattress with strong edge support to maximize the usable sleep surface, motion isolation to help reduce disturbances from a partner and breathable materials to promote a more comfortable sleep environment. A cooling king mattress with gel-infused foam, ventilated comfort layers or a breathable cover may be helpful for side sleepers who tend to sleep warm. Mattress Firm Sleep Experts® can help you compare side sleeper king mattresses, including memory foam, hybrid and pillow-top options, so you can find the supportive, comfortable fit that helps you get better zzz's.

What should side sleepers look for in a king mattress? + -

Side sleepers may prefer a mattress with cushioning comfort and responsive support. Look for materials that contour around the shoulders and hips while helping maintain a neutral spinal position.

What mattress firmness is best for side sleepers? + -

Many side sleepers enjoy a medium-soft to medium-firm feel because it can provide pressure-relieving comfort without feeling too plush. Personal preference, body type and sleeping position can all influence the ideal firmness.

Which mattress materials are comfortable for side sleepers? + -

Memory foam, latex and hybrid mattresses can all be comfortable options for side sleepers. Memory foam offers contouring comfort, latex provides responsive cushioning and hybrids combine comfort layers with supportive coils.

How can a mattress support proper alignment for side sleeping? + -

A supportive side sleeper mattress should cushion the shoulders and hips while keeping the middle of the body from sinking too deeply. A comfort layer with responsive support can help promote a more naturally aligned sleep position.

Can couples with different sleep preferences share a side sleeper mattress? + -

Yes. Couples may want to consider a mattress with balanced support, motion-reducing comfort layers or customizable firmness options. These features can help accommodate different preferences while maintaining comfortable support for side sleeping.