Form a barrier around your mattress with the Hypoallergenic and Waterproof Mattress Protector. Constructed from 40% Ployester, 35% Cotton and 25% Polyurethane, this mattress protector features a waterproof backing to help protect your mattress against unwanted spills, sweat, and bacteria. This fitted sheet style mattress protector is fully elasticized to fit any mattress up to 22" thick and is completely noiseless thanks to its vinyl-free construction. This hypoallergenic machine washable mattress protector is as easy to clean as it is to use.