Heavy-duty 600-denier polyester construction with polyurethane coating for UV-protection and water-resistance Vent guard system allows cover to breathe, reducing moisture buildup Aluminum-coated heat shields allow cover to be used on hot pipes Windshield area is made of non-abrasive material to prevent scratching Elastic hems and web tie-down X-large features hook-and-loop slot in the rear for easy access to luggage and accommodation of dual antennas