Waterproof membrane and provides softness and comfort. Protect your mattress while adding comfort! This down alternative Mattress pad is truly luxurious and it's allergy free. The soft and lofty down alternative filling feels like real down! The 100% microfibr fabric feels really soft & smooth. The beautiful design gives it that fine classic touch. The mattress pad won't slip off of your bed. Made of 100% polyester microfiber. Machine washable for easy cleaning.