Top and side waterproof protection, 5-sided protection, The 400 TC cotton cotton surface and box-stitched quilting add functionality and appeal to the Quilt Tite® mattress protector. A soft layer of down alternative filling helps to create an air layer for better circulation, breathability and comfort. The laboratory-certified H2Pro® liquid-proof membrane adds a protective barrier against allergens, dust mites, and liquids. The Universal Fit® design guarantees a secure fit for mattress depths 6"-22" and gives five sides of protection for your mattress top and sides., 400 thread count 100% cotton shell, Box stitch quilting with down alternative fill, Quilt Tite® Mattress Protector, 400 TC cotton shell and box-stitched quilting with down alternative fill, Air layer increases breathability, circulation and comfort