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The Cobalt Calm Extra Firm Mattress by Serta
Manufacturer: Serta
Availability: Temporarily Out of Stock - Allow 4-12 weeks for delivery. Contact Store for details.
Delivery Available for Delivery

Picture of COBALT CALM XFIRM KING MATTRES

COBALT CALM XFIRM KING MATTRES

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SKU: COBALT-XFM-6/6-MATT
Please call our store for the latest promotional pricing.
The Perfect Sleeper® Cobalt Calm Extra Firm is an extra-firm, supportive mattress with a 12” profile, essential cooling features, and targeted support. It gives the sensation of lying on top of the mattress with little give. Featuring an 825-coil density system, this classic quilted-top mattress offers zoned comfort, pressure relief, and memory foams that contour your body—plus upgrades available with more cooling layers and support.

Please note that the picture may not reflect the correct mattress size selected.

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

Pressure Relief - Contouring memory foams help relieve aches and pains

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

Motion Control - Designed to minimize the impact of your partner's movement

Best for stomach and back sleepers

PillowSoft® Aire

Soft foam provides enhanced cushioning for exceptional comfort and promotes airflow through its unique, gently rippling design

Serta® Support Foam

Strikes the ideal balance of cushioning and support

Gel Band Support

Gel foam lumbar support band provides support for the lower back and hips

825 Edition Custom Support System

An 825-coil density system that provides contouring, cradling support and minimizes motion transfer

Serta® Balanced Support Foam

Strikes the ideal balance of cushioning and support, no matter how firm or plush you prefer your mattress



The Perfect Sleeper® Cobalt Calm Extra Firm is an extra-firm, supportive mattress with a 12” profile, essential cooling features, and targeted support. It gives the sensation of lying on top of the mattress with little give. Featuring an 825-coil density system, this classic quilted-top mattress offers zoned comfort, pressure relief, and memory foams that contour your body—plus upgrades available with more cooling layers and support.

Please note that the picture may not reflect the correct mattress size selected.

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

Pressure Relief - Contouring memory foams help relieve aches and pains

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

Motion Control - Designed to minimize the impact of your partner's movement

Best for stomach and back sleepers

PillowSoft® Aire

Soft foam provides enhanced cushioning for exceptional comfort and promotes airflow through its unique, gently rippling design

Serta® Support Foam

Strikes the ideal balance of cushioning and support

Gel Band Support

Gel foam lumbar support band provides support for the lower back and hips

825 Edition Custom Support System

An 825-coil density system that provides contouring, cradling support and minimizes motion transfer

Serta® Balanced Support Foam

Strikes the ideal balance of cushioning and support, no matter how firm or plush you prefer your mattress



Products specifications
Attribute name Attribute value
Height 12
Mattress Comfort Level Extra Firm
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