The water-stop mattress protector is designed to protect your mattress from unexpected accidents. It is made from natural cotton on the top side, which is light and durable, while providing great protection for the mattress. The water protecting membrane on the bottom side is breathable and does not make a rustling sound when the child turns over it. You can easy put the mattress protector under the fitted sheet. Elastic ribbon in each corner keeps the mattress protector in place during the night.