Used in fine hotels, our premium mattress protector has a top layer of 100% natural terry cotton for softness and absorbency and a waterproof polyurethane film backing so any accidental spills are absorbed but not allowed to penetrate - so your mattress remains stain free and hygenic. It's also effective at preventing bacteria and dust mites from breeding in your mattress. It slips on or off your mattress easily for high temperature machine washing and medium temperature drying.