This Serta Perfect Sleeper supports you well with a Custom Support Coil System. These Individually Wrapped Coils contour to your body offering full support. Encased with high density foam for extended mattress surface use and a firm sitting edge. Specialized Foam, Engineered Fibers and a super stretch premium cover provide pressure point relief. Cool Twist™ Gel Foam adds support as it disperses heat letting you sleep calmly and coolly. Sleep well in a Serta Perfect Sleeper.