Kensington Memory Foam Back RestRelieve pressure and get ultimate comfort with memory foam. The back rest gently molds to your body shape, and is adjustable to easily fit almost any chair. 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 dissipates pressure to provide maximum comfort for you Easy