This mattress is built to feel like a traditional plush model while offering the benefits of the gel memory foam technology. It features a layer of Cool Action™ Dual Effects® Gel Memory Foam for enhanced cooling and comforting and targeted support. Plus, a layer of Serta® PillowSoft™ Foam gently contours to the body for enhanced cushioning. Every iSeries® mattress features the exclusive Duet® Coil Individually Wrapped Coil-in-Coil Support System. This advanced innerspring is designed to respond to each sleep partner individually, intelligently sensing which areas of the body need cradling comfort and which need deep postural support.