The right choice for protecting your boat when trailering or mooring, Covermate HD 600 Covers are made of heavy-duty 600-denier marine-grade polyester fabric for years of service. Offering extreme resistance to water, stains, UV, and mildew, this silver reflective fabric is designed to keep your boat cooler on hot summer days. Reflective stripe at the stern provides added safety when trailering, day or night. Exclusive venting system for mildew-free use. Double-stitched double-ply seams add strength and durability. Reinforcement panels are sewn-in for long life. Quick-release buckles and web straps with a unique over-under tie-down system allow a snug fit. Sewn-in elastic shock cord.