An extra cushioned sleep surface and a cool feel are what Serta delivers with its Classic 11"" Plush Mattress. Cool Twist Gel is swirled directly into a breathable foam that promotes airflow and heat dissipation which are both conducive to a deeper sleep. Individually wrapped coils in concert with Serta PillowSoft Foam provide contouring and cradling support so you always feel firmly planted while still enjoying a cushioned surface.