Brookside Soft Jersey Mattress Protector, Waterproof and Dust Mite Proof, King Soft jersey fabric with a waterproof backing that prevents the passage of fluids, dust mites and common allergens Fitted protector has a knit skirt with elastic that stretches to accommodate most mattresses Easy care protector can be machine washed and dried on low heat Vinyl-free waterproof backing is safe for kids King protector measurements: 76" x 80"