TEMPURCloud Prima Medium-Soft Mattress, Split California King (Purchase 2 to Complete California King Set) 10-inch thick medium-soft mattress formulated from temperature-features material to provide support for your body and helps distribute body weight evenly across the mattress Designed with a comfort layer made from highly conforming temperature-features material to determine the feel of the mattress and works to allow for personalized comfort and support The SmartClimate System helps you stay comfortable during the night to draw moisture away, while the SmartClimate treatment in the inner cover provides cool to-the-touch comfort Designed with a high-loft, super-stretch premium fabric cover with grey upholstered sides Two mattresses needed to complete a California King