Weighing 9.25 oz. per square yard with 24 brilliant colors from which to choose. Genuine Sunbrella is 100% acrylic and undoubtedly the longest lasting boat cover and top fabric made. This premium synthetic material is solution dyed so the brilliant colors are as fade-proof as you can get. Sunbrella is strong, water-repellent, and resists mildewing. It's world renowned for prolonging sun rot from ultraviolet rays. Sunbrella is used on boats from dinghies to yachts when nothing but the best will do. Up to 10-year limited warranty. Orders for Covermate Exact-Fit Covers cannot be canceled and are non-returnable and non-refundable. For a free Sunbrella Sample Card, order item number 314599. Exact Fit Covermate Sunbrella Boat Cover for CROWNLINE 21 CLASSIC 21 CLASSIC w/FACTORY TOWER CUTOUTS I/O. Ocean Blue Trailerable: Yes Material: 9.25 oz. 100% acrylic | Covermate Exact Fit Sunbrella Boat Cover for Crownline 21 Classic 21 Classic w/ Factory Tower Cutouts I/O. Ocean Blue | Acrylic