This Serta Perfect Sleeper Mattress supports you with a Custom Support Coil System. These Individually Wrapped Coils contour to your body offering excellent support. Two rows of denser coils on both side of the mattress provide 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 Memory Foam adds support as it disperses heat letting you sleep calmly and coolly. Sleep well in a Serta Perfect Sleeper.