Serta Perfect Sleeper Cobalt Calm Firm Pillow Top 14.5" Mattress


Serta Perfect Sleeper Cobalt Calm Firm Pillow Top 14.5" Mattress

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Size: Twin
  • Delivery in 4 - 6 Weeks*

Why Do Customers Love US-Mattress?

  • 120 Night In-Home Trial
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About the Cobalt Calm Firm Pillow Top Mattress

Featuring a 3-zoned coil design, this mattress offers pressure relief and support where you need it, with Cool Twist® Gel Memory Foam that contours to your body.


  • Cool Twist® Gel Memory Foam - This unique design features cooling gel swirled into premium memory foam. This breathable memory foam helps enhance airflow and heat dissipation for a feeling that can only be described as a cool, contouring type of comfort.
  • 3 Zoned Coil Design - This 850-coil density system offers three support zones with targeted support for your lower back and hips and cradled comfort everywhere else.
  • Anti-Microbial Technology - Our anti-microbial mattress technology will keep your mattress fresh and clean from odor-causing bacteria.
  • Custom Support Coil System - This 825-coil density system provides contouring, cradling support and minimizes motion transfer.
  • Phase Change Material - Stay temperature-regulated with this technology, which absorbs body heat, and then releases it if you cool down too much. 
  • Best Edge® Foam Encasement - Added support for the edge makes it easier to sit down as well as get out of bed. It also makes the sleeping surface more stable and increases the durability of the mattress.





Edge Support


Low Motion Transfer

Lumbar Support

Reinforced Center

Moisture Wicking


Made in USA

10 Year Warranty

1” PerfectPure Fiber

1" PillowSoft Aire

0.5" Support Foam

2" Cushion Quilt Foam

1" Cool Twist Gel Memory Foam

1" Support Foam

8” 850 3 Zoned Coil System

1” Balanced Support Pad

Comfort: Medium-Firm, 4

Style: Pillow Top Innerspring

Coil count:

  • Twin: 473 
  •  Twin XL: 522 
  •  Full: 655 
  •  Full XL: 722 
  •  Queen: 823 
  •  King: 1,059 
  •  Cal King: 1,125
  • Split Cal King: 1,064

Coil Gauge: 14.75

Read More About Product


  • Pressure Relief
    Pressure Relieving

    Incorporates a layer of conforming materials that mold to your body, offering appropriate support and alleviation.

  • Supportive

    Incorporates a support mechanism designed to adapt to your body's contours, promoting balanced weight distribution for optimal alignment.

  • Cooling Technology
    Cooling Technology

    Incorporates materials and elements engineered to regulate temperature by dispersing heat away from the body, ensuring a cool and comfortable sleep experience.

  • Motion Transfer
    Motion Transfer Reduction

    Motion isolation attributes aid in separating your partner's movements, such as tossing, turning, or shifting during sleep, promoting longer, uninterrupted rest for you.

  • Adjustable Base Friendly
    Adjustable Base Friendly

    This mattress is compatible with adjustable bases, which can raise your head and/or feet, easing snoring, sinus pressure, enhancing circulation, and providing numerous other health advantages.


Height: 14.5"

Comfort: Medium

Quilting Layer

Antimicrobial Protection

CoolFeel Fabric

Fiber Layer

Comfort Layer

PillowSoft® Aire

Serta® Support Foam

Cushion Quilt Foam

Cool Twist® Gel Memory Foam

Support System

Serta® Support Foam

850 3-Zoned Coil System

Serta® Balanced Support Foam

Works With All Bed Types

  • Box Spring

    Box Spring

  • Traditional Frames

    Traditional Frames

  • Adjustable Bases

    Adjustable Bases

  • Platform


Your mattress purchase is fully compatible with the selections shown above!

Build Your Perfect Sleep System

Adjustable Base
Adjustable Base
A sturdy adjustable base puts you in control of your sleep setup.
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The perfect pillow creates the ideal balance of softness and support.
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Mattress Protector
Mattress Protector
Keep your mattress safe from stains, water, and changing temperatures.
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