Labor Day Sale On King Size Side Sleeper Mattresses

Shop the Labor Day Promotion On King Size Side Sleeper Mattresses at Mattress Firm to find a king size mattress that fits your sleep preferences and budget. Explore a range of options for side sleepers and take advantage of seasonal savings while supplies last.

Sleepy's By Sealy Memory Foam Medium Mattress

3584

Starting at

$589⁹⁹

$889⁹⁹

$300 OFF

Medium Comfort, best for

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

Serta Perfect Sleeper Sleep Excellence Medium PillowTop Mattress

1467

Starting at

$1999⁹⁹

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

3710

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

2809

Starting at

$819⁹⁹

$1499⁹⁹

$680 OFF

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

5601

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

5601

Starting at

$429⁹⁹

$1019⁹⁹

$590 OFF

Medium Comfort, best for

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

Purple Original Mattress

59815

Starting at

$1899⁰⁰

$2199⁰⁰

$300 OFF

Medium Comfort, best for

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

Beautyrest BR800 12" Plush Euro Top Mattress

762

Starting at

$569⁹⁹

$1399⁹⁹

$830 OFF

Plush Comfort, best for

Side Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

Tulo Bamboo 8" Medium Green Tea Memory Foam Mattress

5601

Starting at

$329⁹⁹

$809⁹⁹

$480 OFF

Medium Comfort, best for

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

Sealy Essentials Winter Green 12" Medium Euro Top Mattress

604

Starting at

$739⁹⁹

$1379⁹⁹

$640 OFF

Medium Comfort, best for

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

Beautyrest Silver BRS900 12" Plush Mattress

1166

Starting at

$729⁹⁹

$1699⁹⁹

$970 OFF

Plush Comfort, best for

Side Sleepers
Temperature
Pain
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Nectar Premier 13" Medium Memory Foam Mattress

580

Starting at

$1099⁰⁰

$1799⁰⁰

$700 OFF

Medium Comfort, best for

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

Tempur-Pedic TEMPUR-Adapt 2.0 11" Medium Hybrid Mattress

3096

Starting at

$3099⁰⁰

$3299⁰⁰

$200 OFF

Medium Comfort, best for

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

$300 Instant Gift⁴ with purchase of a mattress set + Calm app 3-month free trial.

Sealy Essentials Winter Green 12" Plush Euro Top Mattress

394

Starting at

$739⁹⁹

$1379⁹⁹

$640 OFF

Plush Comfort, best for

Side Sleepers
Bed Partner
Pain
Temperature
Toss and Turn
Allergies

Purple Plus Mattress

2063

Starting at

$2199⁰⁰

$2599⁰⁰

$400 OFF

Medium Comfort, best for

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

Purple Restore 11.5" Soft Hybrid Mattress

1689

Starting at

$2999⁰⁰

$3399⁰⁰

$400 OFF

Plush Comfort, best for

Side Sleepers
Pain
Allergies
Bed Partner
Toss and Turn
Temperature

A Labor Day sale on king size side sleeper mattresses can be a practical time to upgrade a shared sleep space, refresh a guest room or create more room to stretch out during the night. A standard king mattress measures 76 inches wide by 80 inches long, giving couples personal space while accommodating sleepers who shift positions or prefer to sleep on their side. Side sleepers typically place more weight on the shoulders and hips, so the right mattress should cushion those areas without allowing the midsection to sink too deeply. A comfortable design often combines pressure-relieving comfort layers with a supportive core that helps keep the head, shoulders, hips and ankles in a more even line. Mattresses with foam, responsive springs or a combination of both can work well, depending on the feel you prefer. Softer comfort layers may allow the shoulder and hip to settle into the surface, while a medium or medium-firm feel can provide a balance of contouring and support for many side sleepers. Personal preference, body shape and sleeping position all matter, so a mattress that feels supportive to one person may feel too firm or too plush to another. If you share the bed, consider how well the mattress limits motion transfer when one person turns over or gets up before dawn. A king size mattress with strong edge support can also make the full sleep surface feel more usable and may make it easier to sit down or stand up. During cooler months, breathable covers and airflow-friendly materials can help prevent heat from building up beneath blankets, while a comfortable set of sheets and a supportive pillow can complete the setup. Side sleepers often benefit from a pillow with enough height to fill the space between the shoulder and neck, plus a pillow between the knees to encourage a more comfortable hip position. These details can make the room feel inviting on an ordinary evening, whether you are settling in after a long day or making space for a guest who appreciates a generous sleep surface.

When comparing king size side sleeper mattresses during a Labor Day sale, look beyond the displayed price and review the details that affect long-term value. Sale pricing may vary by mattress size, firmness, materials and included services, so confirm that the advertised offer applies to the king size selected. Check delivery options, setup availability, removal of an old mattress, financing terms, the length of any in-home trial and the coverage provided by the warranty. It is also helpful to measure the bedroom, stairways and doorways before ordering, especially when replacing a smaller mattress with a king. The bed frame or foundation should be designed to support the mattress correctly, since an unsuitable base can affect comfort and may affect warranty requirements. Couples with different preferences may want a mattress that balances cushioning with responsiveness, or they may choose an adjustable base to raise the head or legs and personalize each side of the bed. Shoppers who prefer a more enveloping feel may lean toward cushioning foam, while those who like easier movement may appreciate a responsive hybrid or innerspring design. People who sleep on their side only part of the night may prefer a versatile comfort level that also feels comfortable when lying on the back. A king mattress can be a thoughtful household purchase for newlyweds, growing families who share occasional bedtime visits, hosts preparing a guest room or anyone ready to replace a worn sleep surface before the cooler season encourages more time indoors. For a smaller bedroom, a twin size option may be a better fit, and shoppers can explore Labor Day Sale On Twin Size Side Sleeper Mattresses for another size category. Before choosing, consider your usual sleep position, preferred feel, temperature preferences, partner’s needs and available space. A well-matched king size side sleeper mattress should feel welcoming when you first lie down, provide steady support as you rest and remain comfortable through the changing seasons. With thoughtful comparison and the right foundation, a Labor Day mattress purchase can help turn a bedroom into a calmer, more restorative place to sleep.

What mattress materials are commonly available for side sleepers? + -

Mattresses for side sleepers commonly feature memory foam, latex, innerspring or hybrid construction. Memory foam contours to the body, latex offers a responsive feel and hybrids combine foam layers with individually wrapped coils.

What firmness is typically preferred by side sleepers? + -

Many side sleepers prefer a medium to medium-soft feel with cushioning comfort layers. Personal comfort preferences, body shape and sleep position can all influence the ideal firmness.

What mattress features should side sleepers look for during the Labor Day promotion? + -

Look for comfort layers made with memory foam or other pressure-relieving materials, a supportive core and a cover designed for breathability. Hybrid designs can also offer a balance of cushioning and responsive support.

Are hybrid mattresses a good option for side sleepers? + -

Hybrid mattresses combine foam comfort layers with a coil support system. This construction can provide a blend of cushioning, responsiveness, airflow and edge support for side sleepers.

How can side sleepers choose between memory foam and an innerspring mattress? + -

Memory foam is known for its contouring feel and reduced motion transfer, while innerspring mattresses typically offer a more responsive feel and increased airflow. A hybrid mattress combines elements of both designs.