Fourth Of July Medium Firm King Mattresses Sale

Celebrate better sleep and bigger savings with the Fourth of July medium firm king mattresses event. Discover incredible savings on king-size mattresses designed to offer just the right balance of comfort and support. Whether you’re upgrading your main bedroom or creating a restful guest space, this limited-time event is the perfect opportunity to find your ideal fit. Enjoy easy shopping, expert guidance from our Sleep Experts®, and special offers that make it simple to get more zzz’s for less.

Sort & Filter

Sleepy's By Sealy Memory Foam Medium Mattress

3341

Starting at

$530⁹⁹

$1330⁹⁹

$800 OFF

Medium Comfort, best for

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

Serta Perfect Sleeper Charlotte 2.0 Medium Euro Top Mattress

2604

Starting at

$750⁹⁹

$1500⁹⁹

$750 OFF

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's Rest Medium Innerspring Mattress

6926

Starting at

$375⁰⁰

$1250⁹⁹

$875 OFF

Medium Comfort, best for

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

Serta Perfect Sleeper Sleep Excellence Medium PillowTop Mattress

1396

Starting at

$2000⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Tempur-Pedic TEMPUR-Adapt 11" Medium Previous Generation Mattress

3552

Starting at

$2030⁷⁷

$2899⁰⁰

$869 OFF

Medium Comfort, best for

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

Beautyrest PressureSmart 2.0 Hybrid Medium 13" Mattress

1755

Starting at

$1475⁰⁰

$2950⁹⁹

$1475 OFF

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest BR800 13.5" Medium Pillow Top Mattress

1832

Starting at

$750⁹⁹

$1500⁹⁹

$750 OFF

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Tulo Bamboo 8" Medium Green Tea Memory Foam Mattress

5481

Starting at

$293⁹⁹

$810⁹⁹

$517 OFF

Medium Comfort, best for

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

Beautyrest Silver BRS900 11.75" Medium Firm Mattress

1707

Starting at

$750⁹⁹

$1000⁹⁹

$250 OFF

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Purple Original Mattress

30175

Starting at

$1499⁰⁰

$1999⁰⁰

$500 OFF

Medium Comfort, best for

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

Sleepy's By Sealy Slumber Cushion Firm Mattress

278

Starting at

$2000⁹⁹

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

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

940

Starting at

$3999⁰⁰

$4599⁰⁰

$600 OFF

Medium Comfort, best for

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

Receive $300 Instant Gift⁴ with purchase.

Sleepy's By Sealy Slumber Medium Mattress

161

Starting at

$640⁹⁹

$2300⁹⁹

$1660 OFF

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sealy Essentials Winter Green 12" Medium Euro Top Mattress

603

Starting at

$690⁹⁹

$1380⁹⁹

$690 OFF

Medium Comfort, best for

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

Nectar Premier 13" Medium Memory Foam Mattress

369

Starting at

$1099⁰⁰

$1799⁰⁰

$700 OFF

Medium Comfort, best for

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

Nectar Luxe 14" Medium Memory Foam Mattress

231

Starting at

$1499⁰⁰

$2249⁰⁰

$750 OFF

Medium Comfort, best for

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

Celebrate this Independence Day in comfort and style by taking advantage of our highly anticipated Fourth of July medium firm king mattress event. At Mattress Firm, we understand that the right level of mattress firmness is essential for restorative sleep, and medium firm mattresses have become a customer favorite for their ideal balance of comfort and support. Our Fourth of July mattress promotion features a wide selection of premium medium firm king mattresses from leading brands like Serta, Sealy, Tempur-Pedic®, Sleepy's, and more. Whether you prefer memory foam, hybrid, or innerspring constructions, you’ll find exclusive savings on top-rated models designed to promote proper spinal alignment and relieve pressure points while you rest.

Enjoy unbeatable value during our Fourth of July king mattress event, with special offers crafted specifically for shoppers seeking a spacious sleep surface without compromising on support. Medium firm king mattresses are perfect for couples or individuals who crave extra room while benefiting from a universally comfortable feel that adapts to multiple sleep positions. Shop now to score limited-time price drops and special financing options on our best-selling medium firm king beds. Revamp your primary bedroom or guest suite just in time for summer festivities—all while maximizing value with free delivery options and comprehensive warranties available on select models. Don’t miss out on your chance to experience luxurious sleep at an unbeatable price during our Fourth of July medium firm king mattresses event!

Q: What are the benefits of choosing a medium firm king mattress?
A: A medium firm king mattress offers a balanced feel that provides both support and comfort. It's ideal for couples with different sleep preferences, as it helps maintain proper spinal alignment while still offering enough cushioning for pressure relief.
Q: Who is a medium firm mattress best suited for?
A: Medium firm mattresses are well-suited for combination sleepers, back sleepers, and those who prefer a balance between softness and support. They can also be a good choice for couples with varying comfort needs.
Q: How does a king mattress enhance sleep quality?
A: A king mattress provides ample space for individuals or couples to move freely during the night, reducing disturbances from partner movement and promoting better, more restful sleep.
Q: What materials are commonly used in medium firm mattresses?
A: Medium firm mattresses often feature materials such as memory foam, innerspring coils, latex, or hybrid constructions. These materials work together to deliver both support and comfort.
Q: Why shop for a mattress during the Fourth of July event?
A: The Fourth of July is known for special shopping events, making it an excellent time to find promotions on high-quality mattresses. Shoppers can take advantage of limited-time offers to upgrade their sleep experience.