Deluxe Heavy Duty Waterproof Stackable chairs Cover Patio Stacking Chair Covers (Stacking Chair Cover--L85cmW65cmH115/95cm--XS32P) This item is made of 300D woven polyester material with PVC coating, which is premium water-proof,heavy duty and durable. And it has seal tape stick at the inside of the seam, for better water proof.