The Nature's Sleep CertiPUR-US certified Mattress Topper is 3 inches thick and is constructed from 3.25 pound AirCool IQ Gel Memory Foam. Patented AirCool IQ Gel memory foam is aerated for extra cooling & comfort. Lighter foam visco-elastic technology contains larger open memory foam cells that react to the sleeper’s body to increase air flow. Fitted plush cover made from 100% cotton is designed with 18” polyester skirt to keep your mattress protected and in place. Minimizes pressure points while sleeping on any mattress to relieve tossing and turning, and to reduce back, neck, hip and shoulder pain aches.