Keep dust, allergens and pet dander off your baby"s crib mattress and ensure a peaceful night"s sleep with the Bargoose 100% Cotton Zippered Crib Mattress Cover. Made from 100% cotton with a mean pore size of less than 6 microns and a membrane-free, tight-weave construction, this crib mattress cover provides the ultimate protection against dust and dander. Take the mattress cover on and off easily with its rust-proof zipper. Machine wash cold and tumble dry low.