HEAVY DUTY PONTON BOAT COVER: Pontoon Boat Cover 17-20ft is designed to protect your boat from harsh outdoor elements such as sun, wind, rain, snow and debris.WATERPROOF PONTON COVER: Designed with 4-layer waterproof PU coating to resist water pressure up to 1500 Pa, double-needle seams and waterproof sealed seam tape provide an indestructible waterproof fortress.Ultimate Wind Protection:Rear vents promote airflow, reducing pressure during storms for unmatched wind protection.DUAL PURPOSE STORAGE BAG: Comes with a spacious storage bag that can also be used as a motor cover. Protect your engine from rain, dust, snow and frost, double the protection!