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. Box spring/foundation sold separately Top type: tight top Mattress type: innerspring Pillow Soft ® Aire is a soft foam that provides enhanced cushioning for exceptional comfort and promotes airflow through its unique, gently rippling design Serta PillowSoft ® Foam is an extra-soft foam that gently contours to the body to provide enhanced cushioning comfort Cool Twist ® Gel Memory Foam is cooling gel swirled into premium memory foam designed to promote airflow and heat dissipation for a feeling that can only be described as a cool, contouring type of comfort Cool Twist ® Gel is a cooling gel swirled directly into a breathable foam designed to promote airflow and heat dissipation Serta's BestEdge® Foam Encasement technology is an extra-deep foam rail to help reduce edge roll-off and extend the sleep surface Individually Wrapped Coils that provide contouring, cradling support Coil count: 815 Compatible with an adjustable bed