Make bedding changes easy by covering your crib mattress with this protective sheet from Circo®. The thick cotton cover easily slips over any standard-sized crib mattress and zips closed to provide a protective layer. Guarding your crib mattress from accidents is the easiest way to secure your investment and ensure your baby"s bed will last for years. The zip-on sheet is made out of a soft cotton that is comfortable enough for baby"s skin, and it washes easily in a machine.