Serta's Classic Elite 15" Plush Pillowtop Mattress provides a cooling and supportive surface that delivers the trusted comfort of Serta. 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. A pillowtop design along with Pillow Soft Aire foam add even more cushioning so you feel as if you are sleeping on a cloud.