100% Waterproof :Queen Zippered Mattress Encasement is 100% Waterproof from all 6 sides,offers premium protection against liquids ,accidentail spills,stains and moisture, helps in keeping clean your luxury mattress. Featuring impermeable Polyurethane membrane,which does not allow the liquids to reach the mattress. Works great for sweaty sleepers, people who eat in bed, couples with young children or pets.Zippered Waterproof Queen Mattress Cover also prevents from bad smells.