Add a luxurious comfort to your bed without any unpleasant over heating this mattress topper has a special coolblue top layer of high density pu based foam that has all the properties of memory foam but is designed to help you keep cool on warm nights the lower layer is made of visco elastic memory foam that allows your body to breathe without any compromise on support use this mattress topper in the summer months to ensure a cool nights sleep with all the comfort you would expect from mem