LINENSPA Natural Wool Waterproof Mattress Pad and Protector - Twin NOTE: PLEASE CHECK THE "Sold by" SELLER NAME, located directly above product sizes. Only products sold by LinenSpa are GUARANTEED GENUINE. If you order from a different seller, you will not receive the GENUINE PRODUCT that is shown and advertised. Natural fleeced wool surface is hypoallergenic and adds softness and year-round comfort Waterproof backing allows air to pass while completely blocking out fluids, allergens and dust mites Wool is known for its humidity control and temperature regulating abilities Fitted sheet-style elastic ensures a smooth, secure fit on mattress depths up to 22 inches