Firm King Mattresses With Micro Coils

Explore Firm King Mattresses With Micro Coils at Mattress Firm to find a mattress size and comfort level that suit your sleep preferences. Compare available options, browse helpful details and shop with support from Sleep Experts® as you narrow down your choice.

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Beautyrest BR800 11.25" Firm Mattress

2233

Starting at

$619⁹⁹

$1299⁹⁹

$680 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Toss and Turn
Pain
Bed Partner
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Black Series Three 15" Firm Mattress

2224

Starting at

$4199⁰⁰

$4799⁰⁰

$600 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Purple RestorePremier 13" Firm Hybrid Mattress

1590

Starting at

$4400⁰⁰

$5199⁰⁰

$799 OFF

Firm Comfort, best for

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

Sleepy's By Sealy Spring Medium Mattress

1482

Starting at

$999⁹⁹

$1599⁹⁹

$600 OFF

Medium Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's By Sealy Spring Firm Mattress

1346

Starting at

$1999⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Toss and Turn
Temperature

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Black Series Two 14.25" Firm Mattress

356

Starting at

$3499⁰⁰

$3899⁰⁰

$400 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Beautyrest Black Series Three 16.5" Firm Pillow Top Mattress

297

Starting at

$4599⁰⁰

$5199⁰⁰

$600 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Beautyrest Black Series Three 14.25" Extra Firm Mattress

284

Starting at

$4199⁰⁰

$4799⁰⁰

$600 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Beautyrest Black Series Four 17.5" Firm Summit Pillow Top Mattress

231

Starting at

$5899⁰⁰

$6599⁰⁰

$700 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Beauty Sleep® Midnight Dream 12.5" Firm Mattress

171

Starting at

$669⁹⁹

$1449⁹⁹

$780 OFF

Firm Comfort, best for

Back, Stomach Sleepers
Toss and Turn
Bed Partner
Temperature
Pain

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Black Hybrid Series Three 15" Medium Mattress

153

Starting at

$4599⁰⁰

$5199⁰⁰

$600 OFF

Medium Comfort,

Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Sealy Posturepedic Ashurst II 13" Firm Mattress

124

Starting at

$1299⁰⁰

$1799⁰⁰

$500 OFF

Firm Comfort, best for

Back Sleepers
Pain
Allergies
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Black Hybrid Series Three 14.5" Firm Mattress

102

Starting at

$4099⁰⁰

$4699⁰⁰

$600 OFF

Firm Comfort,

Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Beautyrest Black Hybrid Series Four 16" Plush Apex Top Mattress

Starting at

$5899⁰⁰

$6599⁰⁰

$700 OFF

Plush Comfort,

Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Beautyrest Black Hybrid Series Four 16" Firm Apex Top Mattress

Starting at

$5899⁰⁰

$6599⁰⁰

$700 OFF

Firm Comfort,

Pain
Bed Partner
Temperature
Toss and Turn

$300 ⁶ adjustable base instant gift with purchase.

Sealy Posturepedic Plus Norman II 13" Ultra Firm Mattress

Starting at

$1499⁰⁰

$1899⁰⁰

$400 OFF

Extra Firm Comfort, best for

Back Sleepers
Pain
Allergies
Bed Partner
Toss and Turn

Receive $200 Instant Gift⁴ with purchase.

Beautyrest Silver BRS900 11.75" Extra Firm Mattress

3296

Starting at

$709⁹⁹

$1699⁹⁹

$990 OFF

Extra Firm Comfort, best for

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

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest Silver BRS900-C 13.75" Extra Firm Mattress

1810

Starting at

$859⁹⁹

$1999⁹⁹

$1140 OFF

Extra Firm Comfort, best for

Back, Stomach Sleepers
Temperature
Pain
Bed Partner
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Sleepy's By Sealy Slumber Cushion Firm Mattress

301

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

Tempur-Pedic TEMPUR-ProAdapt 2.0 12" Firm Mattress

4992

Starting at

$3799⁰⁰

$4199⁰⁰

$400 OFF

Firm Comfort, best for

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

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

Beautyrest Black Series Three 15.25" Medium Mattress

2287

Starting at

$4199⁰⁰

$4799⁰⁰

$600 OFF

Medium Comfort, best for

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

$300 ⁶ adjustable base instant gift with purchase.

Purple RestorePlus 13" Firm Hybrid Mattress

1667

Starting at

$3600⁰⁰

$4399⁰⁰

$799 OFF

Firm Comfort, best for

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

Beautyrest Black Series Two 15.5" Medium Mattress

513

Starting at

$3499⁰⁰

$3899⁰⁰

$400 OFF

Medium Comfort, best for

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

$300 ⁶ adjustable base instant gift with purchase.

Beautyrest Black Series Three 16.25" Medium Pillow Top Mattress

470

Starting at

$4599⁰⁰

$5199⁰⁰

$600 OFF

Medium Comfort, best for

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

$300 ⁶ adjustable base instant gift with purchase.

Beautyrest BR800 Greenwood 10.5" Firm Mattress

3404

Starting at

$1299⁹⁹

Firm Comfort, best for

Back, Stomach Sleepers
Bed Partner
Toss and Turn
Temperature
Pain

FREE ADJUSTABLE BASE ³ with code ELEVATE

Beautyrest PressureSmart 2.0 Extra Firm 13.5" Mattress

2187

Starting at

$1449⁹⁹

$2899⁹⁹

$1450 OFF

Extra Firm Comfort, best for

Back, Stomach Sleepers
Temperature
Bed Partner
Pain
Toss and Turn

FREE ADJUSTABLE BASE ³ with code ELEVATE

Firm king mattresses with micro coils combine a supportive sleep surface with the responsive comfort of individually wrapped coil layers. Designed for couples and anyone who enjoys more room to stretch out, a king mattress provides generous space while a firm comfort level helps promote a stable, well-supported feel. Micro coils, sometimes called mini coils, are smaller coils placed within the comfort system to add targeted contouring and responsiveness without sacrificing the solid support many sleepers prefer. This layered design can help distribute body weight, reduce motion transfer and make it easier to change positions throughout the night. For shoppers searching for a firm king mattress with micro coils, this construction offers a balanced alternative to an extra-hard sleep surface by pairing durable support with subtle cushioning. The best firm king mattresses with micro coils may also help improve airflow through the mattress, supporting a cooler and more comfortable sleep environment. Micro coil technology can enhance pressure relief around the shoulders, hips and lower back while the firm support core helps maintain a level, dependable foundation. Consider your preferred sleep position, body type and comfort preferences while comparing firm king mattresses, including hybrid, innerspring and foam models with micro coil layers. Side sleepers may prefer a firm mattress with added cushioning, while back and stomach sleepers often appreciate the even support of a firmer surface. Exploring different mattress materials, coil systems and comfort layers can help you find a king mattress that supports better zzz's and fits your bedroom setup.

What are micro coils in a firm mattress? + -

Micro coils are small, individually wrapped coils layered near the top of a mattress. In a firm mattress, they can add structure and a responsive feel while working with the mattress’s comfort layers.

How does a firm mattress with micro coils feel? + -

A firm mattress with micro coils typically has a structured surface with less sink than a plush mattress. The micro coils may add a responsive, lightly cushioned feel to the top layers.

What materials are commonly used with micro coils in firm mattresses? + -

Firm mattresses with micro coils may combine the coil layer with materials such as memory foam, latex or quilted fabric. Each combination creates a different balance of cushioning, contouring and responsiveness.

Are firm mattresses with micro coils compatible with adjustable bases? + -

Compatibility depends on the mattress design and the adjustable base requirements. Check the manufacturer’s specifications for the mattress and base before pairing them.

How can I choose the right firm mattress with micro coils? + -

Consider how much cushioning you prefer, whether you like a responsive or contouring feel and which comfort materials you enjoy. Testing different firmness levels and construction types can help you compare your options.