Sunforger™ is traditionally used as a high quality boat cover cloth. This 100% cotton "boat shrunk" marine-grade canvas is rugged and hard-wearing. Not only is it mildew, fade, and UV-resistant, Sunforger™ canvas can stand up to the heaviest snow loads, high winds,and ice cover. It remains soft, breathable, and water repellent for years. These South 2 West 8 Bags are hand crafted in the United States and are a shop favorite — the harder you use them the better they get.