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Blue 300 Firm
Split Cal King

The Serta iComfort Blue 300 Firm mattress combines the feel of an extra-firm mattress with the benefits of Serta’s latest breakthroughs in memory foam technology. It combines Serta TempActiv™ Gel Memory Foam with a layer of EverCool® Fuze™ Memory Foam for enhanced cooling comfort that also supports every curve of your body. It also features a layer of Deep Reaction™ Memory Foam for a substantial, deep-down feel not often found in traditional memory foam.

Top Layers of Comfort
¾” TempActiv™ Gel Memory Foam gives you temperature regulation right at the surface. 1” EverCool® Fuze™ Memory Foam contours and supports while also increasing airflow. 1” Serta® Balanced Support Foam provides a firm support feel. 1 ½” Deep Reaction™ Memory Foam adds another layer of conforming support.

Core Layers of Support
At the core of the Blue 300 you’ll find 7” of Serta® Ultimate Edge® Foam. This is the foundation for the advanced Gel Foams. It provides a firm and long-lasting support system.

Our Recommendation
The Serta iComfort Blue 300 mattress is an extra firm option with exceptional pressure relief. Great for back or stomach sleepers who don’t want much sink from the sleep surface.  This model is not recommended for side sleepers.

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Features & Reviews

  • Features
  • Reviews
  • Split Cal King
  • iComfort
Comfort Type
  • Firm
Mattress Type
  • Specialty
  • 10 Years
Model Number
  • 500801288-1071
  • 36"x84"
  • 11.25"
Comfort Layers
  • 3/4" TempActiv Gel Memory Foam, 1" EverCool Fuze Gel Memory Foam, 1" Serta Support Foam, 1.5" Deep Reaction Memory Foam
Support Structure
  • 6" Serta Foam Core