Sleep Inc Sleep Cool 14" Medium Hybrid California King Mattress pairs a responsive coil core with memory foam and a polyurethane comfort layer to deliver balanced pressure relief and dependable support. The breathable cooling cover helps wick heat away from the sleep surface while the medium feel accommodates a range of sleep positions and promotes proper spinal alignment. Made in the USA and built for lasting performance, this California King mattress offers improved motion isolation and reinforced edge support for uninterrupted rest.