Soft, quiet, breathable and 100% waterproof top surface protects your mattress from stains, spills, dust mites, allergens and bacteria. Cotton rich hypoallergenic fabric with noiseless thermal polyurethane backing allows water vapor to go through but not water. It\'s also vinyl free and BPA free, so it\'s safe for children and pets Fits mattress up to 21 inches. The sidewall fabric sides easily stretch to fit mattresses up to 21 inches thick. Easy to keep it clean: It is machine washable and dryable. Sized as Twin, Full, Queen and King, choose the right size as you need.