A champion of comfort for all, Serta has pioneered sleep innovation for more than 90 years, bringing quality products to more than 150 countries worldwide. Serta's award-winning iComfort F15GL 12.5"" Firm Mattress presents a sleep experience that is cool, comfortable, and restorative. Resting between a cool-to-touch CoolTemp Cover and edge-to-edge supportive Serta Foam Core, is a layer of Deep Reaction Max Gel Memory Foam that provides cushioning qualities of deep-down support for a pleasurable, exceptionally supportive sleep.