Waterproof Sheet The surface is a blend of polyester and cotton, and the backing is made of polyurethane. It is machine washable. Used for about a month when my newborn was born, and it has not been used for bedwetting, etc. There are no cracks in the waterproof backing. There is a mark where the rubber band to prevent slipping got caught during washing in one place. *Please check the 4th photo. Material: Surface: 80% polyester, 20% cotton, Backing: 100% polyurethane Size: Length 120cm x Width 70cm Color: Light Gray There is no size notation, so it was measured by an amateur. Please only purchase if you understand that this is a home-stored item. Please refrain from purchasing if you are sensitive to such things.