King Size Mattresses for Side Sleepers

Finding the right king size mattresses for side sleepers can make all the difference in achieving truly restful nights. With extra room to stretch out and support that caters to your preferred sleep position, a king mattress offers both comfort and space for those who settle in on their side. Explore options designed to help you enjoy deeper relaxation, better alignment, and more restorative zzz’s every night. Discover how the perfect king size mattress can help you sleep well so you can live well.

Sort & Filter

Beautyrest PressureSmart 2.0 Plush 11.75" Mattress

6244

Starting at

$1150⁰⁰

$2300⁹⁹

$1150 OFF

Plush Comfort, best for

Side Sleepers
Temperature;Bed Partner;Pain;Toss and Turn;Toss and Turn
Temperature
Bed Partner

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's By Sealy Memory Foam Plush Mattress

2671

Starting at

$1630⁹⁹

Plush Comfort, best for

Side Sleepers
Pain;Bed Partner;Toss and Turn;Temperature
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest PressureSmart 2.0 Plush Pillow Top 13.75" Mattress

2689

Starting at

$1200⁰⁰

$2400⁹⁹

$1200 OFF

Plush Comfort, best for

Side Sleepers
Temperature;Bed Partner;Pain;Toss and Turn;Toss and Turn
Temperature
Bed Partner

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest BR800 13.5" Plush Pillow Top Mattress

2740

Starting at

$1500⁹⁹

Plush Comfort, best for

Side Sleepers
Toss and Turn;Pain;Bed Partner;Temperature
Pain
Bed Partner

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sealy Essentials Winter Green 13" Plush Euro Pillow Top Mattress

546

Starting at

$1460⁹⁹

Plush Comfort, best for

Side Sleepers
Bed Partner;Pain;Temperature;Toss and Turn
Allergies
Temperature

Beautyrest BR800 12" Plush Euro Top Mattress

706

Starting at

$1400⁹⁹

Plush Comfort, best for

Side Sleepers
Toss and Turn;Pain;Bed Partner;Temperature
Pain
Bed Partner

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Silver BRS900 12" Plush Mattress

1097

Starting at

$1700⁹⁹

Plush Comfort, best for

Side Sleepers
Temperature;Pain;Bed Partner;Toss and Turn;Toss and Turn
Pain
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Serta Perfect Sleeper Nurture Night 14.5" Pillow Top Mattress

1081

Starting at

$1249⁰⁰

Plush Comfort, best for

Side Sleepers
Pain;Temperature;Bed Partner;Toss and Turn;Toss and Turn
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Serta Perfect Sleeper Elkins III 11" Plush Euro Top Mattress

1610

Starting at

$1200⁹⁹

Plush Comfort, best for

Side Sleepers
Pain;Temperature;Toss and Turn;Bed Partner
Temperature
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Serta Perfect Sleeper Nurture Night 13.5" Plush Mattress

863

Starting at

$1099⁰⁰

Plush Comfort, best for

Side Sleepers
Pain;Bed Partner;Temperature;Toss and Turn;Toss and Turn
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sealy Essentials Winter Green 12" Plush Euro Top Mattress

391

Starting at

$1380⁹⁹

Plush Comfort, best for

Side Sleepers
Bed Partner;Pain;Temperature;Toss and Turn
Allergies
Temperature

Serta Perfect Sleeper Midsummer Nights 11" Plush Eurotop Mattress

832

Starting at

$999⁰⁰

Plush Comfort, best for

Side Sleepers
Pain;Bed Partner;Temperature;Toss and Turn;Toss and Turn
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Black Series Two 16.25" Plush Pillow Top Mattress

282

Starting at

$4099⁰⁰

Plush Comfort, best for

Side Sleepers
Pain;Bed Partner;Temperature;Toss and Turn;Toss and Turn
Bed Partner
Temperature

$300 ⁶ adjustable base instant gift with purchase.

Tempur-Pedic TEMPUR-ProAdapt 2.0 12" Soft Mattress

3424

Starting at

$4099⁰⁰

Plush Comfort, best for

Side Sleepers
Pain;Allergies;Bed Partner;Toss and Turn;Toss and Turn
Bed Partner
Temperature

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

Purple RestorePlus 13" Soft Hybrid Mattress

1669

Starting at

$3999⁰⁰

Plush Comfort, best for

Side Sleepers
Pain;Allergies;Bed Partner;Toss and Turn;Toss and Turn
Bed Partner
Temperature

Tempur-Pedic TEMPUR-LuxeAdapt 2.0 13" Soft Mattress

1470

Starting at

$5399⁰⁰

Plush Comfort, best for

Side Sleepers
Pain;Allergies;Bed Partner;Toss and Turn;Toss and Turn
Bed Partner
Temperature

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

King size mattresses are an excellent choice for side sleepers seeking both spacious comfort and targeted support. Side sleepers often require a mattress that offers ample cushioning to ease pressure points at the shoulders and hips, as well as proper spinal alignment throughout the night. A king size mattress provides plenty of room for side sleepers to adjust positions and stretch out without ever feeling restricted, which is especially important for couples or individuals who value their own space while sleeping. This extra surface area also allows for the integration of advanced comfort technologies—like zoned support or memory foam layers—that can adapt to your body’s unique contours.

For those who primarily sleep on their side, selecting a king mattress with medium to medium-soft firmness is crucial for achieving optimal pressure relief. Look for mattresses specifically engineered with features such as gel-infused memory foam, plush pillow tops, or hybrid designs that balance contouring comfort with responsive support. These materials conform closely to your curves, helping to prevent common side sleeper discomforts like numb arms or achy joints. Investing in a king size mattress tailored for side sleepers ensures restful nights and a luxurious sleep environment—making it easier to wake up refreshed and free from aches each morning. At Mattress Firm, you’ll find a wide variety of king size mattresses designed to provide the softness, space, and ergonomic benefits that side sleepers need most.

Q: What features should side sleepers look for in a king size mattress?
A: Side sleepers should look for a king size mattress that offers excellent pressure relief, especially around the shoulders and hips. A mattress with a medium to medium-soft feel, contouring memory foam or hybrid construction, and good motion isolation can help ensure proper spinal alignment and comfort throughout the night.
Q: Are certain materials better for side sleepers in a king size mattress?
A: Yes, materials like memory foam and latex are often recommended for side sleepers because they conform closely to the body's curves, providing targeted support and cushioning. Hybrid mattresses that combine innerspring coils with foam or latex layers can also offer a balance of support and pressure relief.
Q: How does firmness level affect comfort for side sleepers on a king size mattress?
A: Firmness level is crucial for side sleepers. A mattress that's too firm may cause pressure points at the shoulders and hips, while one that's too soft might not provide enough support. Most side sleepers find optimal comfort on mattresses rated medium-soft to medium-firm, which cushion pressure points while maintaining spinal alignment.
Q: Can a king size mattress help reduce tossing and turning for side sleepers?
A: A well-chosen king size mattress designed for side sleepers can help minimize tossing and turning by evenly distributing body weight and relieving pressure points. This promotes deeper, more restful sleep by reducing discomfort that might otherwise cause frequent position changes during the night.
Q: Is motion isolation important in a king size mattress for side sleepers who share a bed?
A: Yes, motion isolation is important, especially if you share your king size bed with a partner. Mattresses with good motion isolation prevent movement on one side of the bed from disturbing the other person, which is particularly beneficial for light-sleeping side sleepers.