Kensington Memory Foam Chair Seat Back Rest Support CushionDescriptionSpecificationsShipping Maximum back support with Memory Foam Get ultimate comfort with back support memory foam. Easy to adjust to fit most office chairs Removable Washable cotton polyester fabric cover Give your back full support with high density, viscoelastic memory foam Temperature and pressure sensitive foam molds to body shape Memory foam was originally developed by NASA to relieve astronauts of G force during lift off Memory foam