One of the things you're really going to love about these large pontoon boat covers is the way they fit tight, and when you use the heavy-duty shock cord hem that is created for the skirt of the boat cover, then you can really be snug and secure in knowing your boat cover will be leak-free because of the 100% waterproof special coating that is applied. The special waterproof coating also serves a second purpose, that of offering long term Ultra violet radiation protection from the sun and a superior barrier protection from the wind and the debris that is carried on the wind.You might understand the difference between 300 denier polyester and 600 denier polyester and that is why you can agree it will definitely stand up to the three year warranty test. If you are deciding to store or haul your pontoon boat covered, make sure you use the QuikSnap adjustable strapping system along with your boat cover for extra long lasting protection.Choice of colors, grey or blue.