A good night's sleep can rejuvenate your mind and body, and it is only possible with our mattress protectors. WATERPROOF - Cotton Mattress Protectors are high quality, discreet and 100% waterproof. PROTECTION LAYER - The undetectable layer of polyurethane that makes this mattress protector totally waterproof also serves as an allergen barrier, protecting against dust mites, a major cause of respiratory problems and seasonal allergies.