This mattress pad is the perfect combination of a 100% waterproof mattress pad and quilted topper. Generously overfilled with soft quilting material, which allows air to flow between cover and the waterproof barrier. The 100% waterproof barrier is noiseless and prevents liquids, dust mites and other allergens to pass through. The fitted sheet style can fit mattresses up to 22" high. This is perfect for pillow top mattresses!