Serta Perfect Sleeper Cobalt Calm Extra Firm

Serta Perfect Sleeper Cobalt Calm Extra Firm


Serta Perfect Sleeper Cobalt Calm Extra Firm

Why you'll love this mattress

An extra-firm, supportive mattress with a 12” profile, essential cooling features, and targeted support. Featuring an 825-coil density system, the Cobalt Calm Extra Firm classic quilted-top mattress offers zoned comfort, pressure relief, and memory foams that contour your body.

Comfort Level: Extra Firm

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Serta Perfect Sleeper Cobalt

Serta Perfect Sleeper® Cobalt Calm Extra Firm


Extra Firm


3 zones of cushioning, cradling support with an 850-coil density system

Pressure Relief

Contouring memory foams help relieve aches and pains


Topped with a cool-to-the-touch cover made with CoolFeel™️ fabric

Motion Control

Designed to minimize the impact of your partner's movement

Made for

Best for stomach and back sleepers

Serta Cobalt Extra Firm

A Closer Look
What goes into your Perfect Sleeper mattress

Serta Adoring Night Features

Experience the Benefits of an Adjustable Foundation

Customized Comfort & Support

Adjust the head and/or foot of your mattress to find the perfect position. Plus, select models have advanced features such as variable massage options and pre-set positions!

Ease back, neck & shoulder pain

Elevating the head and foot of the mattress can help alleviate pressure on your back, neck and shoulders.

Improve Circulation

Elevating your head and feet can help increase blood flow, which can help reduce tossing and turning.

Reduce Snoring

With an adjustable foundation, you can adjust the position of your head to help open up airways and help reduce snoring.

Adjustable foundation

More reasons to purchase a Serta Perfect Sleeper® mattress.
Serta Classic Warranty

Data sheet

  • Mattress Type - Innerspring
  • Mattress Comfort - Extra Firm

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