The Lily Pads® our ultimate waterproof mattress pad, has a 100% cotton twill face, 100% waterproof polyester backing, and 5.5 oz of polyester fill per square yard. The layers are quilted together for strength and durability. This mattress pad provides motionless, noiseless, and breathable protection from spills for your mattress. An ultra-fresh finish prevents sweating. A fitted skirt prevents the pad from moving on the mattress. Fits mattress heights up to 18".