The Serta Perfect Day Cashel View Firm King Size Mattress features a Free Flex 3D innerspring for the most supportive innerspring on the market today. It is topped with 2" of Talalay Latex for body contouring, and buoyant support. Each Serta Perfect Day Cashel View Mattress is designed to give you the rejuvenating sleep you need each night. The most advanced technology is used in each mattress to help reduce various sleeping problems, giving you a deeper sleep. Each Perfect Day mattress is designed to look as beautiful as it feels.