Sharkskin Plus weighs on 6.5 oz. per square yard and is the most practical, user-friendly, efficient boat cover material you'll find anywhere. This lightweight polyester is as strong and durable as fabrics twice its weight. A real workhorse when it comes to protecting boats, Sharkskin Plus is intensely repulsive to water, mildew, and UV rays. Its sleek, fade-resistant, breathable finish resists staining and assures maximum cover life.