Rest Assure Knitted Fabric 100% Waterproof Mattress Cover Protects against dust, dust mites, allergens, and bacteria. Completely covers the mattress for added protection. Fits mattresses 8"-24" in height Made with soft knitted fabric for a soft sleeping surface. With breathable polyurethane backing for a cool and comfortable feeling. 100% waterproof. Will repel spills, accidents, and stains