The Hippychick mattress protectors are high quality, discreet, breathable and 100% waterproof. Made from pure brushed cotton, it is difficult to believe that something that feels so soft and luxurious can be so practical. The undetectable layer of polyurethane makes these protectors 100% waterproof without the awful feeling of lying on or being sandwiched between a crisp packet! It also acts as an anti-allergy barrier protecting against dust mites, a major cause of hayfever and asthma.