this mattress protector features elastic bands for a secure fit, it is waterproof while adding a plush layer of comfort to the top of any bed. Combination of the soft terry face fabric with the TPU (Thermoplastic Polyurethane) reverse fabric allows air circulation. Waterproof Hypoallergenic Elastic bands keep protector securely in place Fits up to 18" deep this protector measures 80" L x 76" W 80% cotton/20% polyester 100% polyester fill Machine wash brand new in the bag