The 100 Series twin mattress pad from RC Willey provides all natural and hypoallergenic comfort while delivering maximum protection for your new mattress. The 100% cotton terry cloth surface offers a cool and dry sleep surface by utilizing imported 2-ply, thick and thirsty cotton. Underneath the soft and comfortable cotton layer is our Whisper Quiet waterproof membrane that completely blocks liquids like food, beverages and all human and pet bodily fluids. Fits all mattresses up to 15” deep. The 100 Series Mattress Protector, helping you to get on with the REST of your life.