Polyform Fender Cover f/A-4 Fender - Black [EFC-A4 BLACK]Fender Cover for A 4 Fender Black Fender covers should be as tough as the fenders they protect. That was our criteria used in developing the Elite Fender Cover series. Polyform uses a premium grade polyester yarn that is resistant to abrasion and UV exposure. Additionally, it resists water absorption better than other materials, keeping fenders manageably light when wet. The cover is woven on a special knitting machine that produces a seamless tube,