HEAVY DUTY PONTON BOAT COVER: The Winter Pontoon Boat Cover 17-20ft is designed to protect your boat from the harsh outdoor elements including sun, wind, rain, snow and debris. Advanced UV resistant technology ensures the pontoon cover will not fade or degrade after years of use, while reinforced seams and double stitched hems provide maximum durability and protection. Perfect for all-weather protection so you can enjoy your boat worry-free. WATERPROOF PONTON COVER: Protect your pontoon boat from rain and water damage with the 17' 18' 19' 20' Pontoon Boat Cover. Designed with a 4-layer waterproof PU coating that resists water pressure up to 1500 Pa, double stitched seams and waterproof sealed seam tape provide an impenetrable fortress of water resistance. Ultimate Wind Protection: Tackle the strongest winds with the 17-20ft Pontoon Boat Cover's rugged windproof system. Industrial-strength snaps and 14 trailerable tie-down straps ensure a secure fit, while elastic shock cords create a custom shape for your boat. Rear vents promote airflow, relieve pressure during storms, and provide unmatched wind protection. DUAL PURPOSE STORAGE BAG: Providing more than just boat protection - our pontoon boat cover comes with a spacious storage bag that can also be used as a motor cover. Protect your motor from rain, dust, snow, and frost for double the protection!