Naturepedic Organic Waterproof Mattress Protector Pad King Size Only used a few times— in excellent, like-new condition. Keep your bed clean and fresh without vinyl/PVC or other questionable waterproofing materials. Our 3-layer system consists of 100% GOTS certified organic cotton on top and bottom with an ultra-thin waterproof layer in the center to block liquids while allowing water vapor to pass through for a more breathable sleep. Plus, our soft, flexible stretch knit fabric is so quiet you won’t even know it's there!