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 F40HD 15"" Medium Mattress was designed for sleep that's cool, comfortable, and restorative. To top it off, a CoolTemp Cover offers a cool-to-touch feel that is conducive to a deeper and more restorative night of sleep. Layers of Custom Fit Hd Memory Foam and Deep Reaction Max Gel Memory Foam add even more support by conforming to your body for a custom-like feel.