Organic Waterproof Pillow Protector slips between your pillow and pillowcase, shielding it from liquids and stains while keeping allergens and dust mites off the pillow surface. Two layers of GOTS-certified organic cotton surround an ultra-thin waterproof membrane derived from cornstarch — so there's no stiff, crinkly plastic sound. The hidden side zipper makes it easy to remove and wash.