Two technologies combine to keep you even cooler and more comfortable at night with the Serta Cool Renew Pillow. Crafted with refreshing gel memory foam, this pillow cradles your head and neck in therapeutic comfort while helping provide an optimal sleep temperature. Then, it’s wrapped in a ConstantCool cover woven with specially treated fibers that deliver an instant cool feeling to your head and neck. Because those fibers won’t wash out, you’ll be able to enjoy cool and restful sleep even after washing.