Classic Accessories Hurricane Pontoon Boat Cover Tough polyester HurricaneTM fabric won't shrink or stretch and is much stronger than ordinary cotton canvas, Resistant to mildew and UV damage Elastic cord sewn into entire bottom hem provides a tight custom fit Tie-down rope and two stern-fit elastic cords included Fits 17'-20'L Pontoon boats, beam to 96"W Adjustable transom flap for a superb fit