Made of Tri-Max coated polyester. Overlapped, double-stitched seams are electronically heat-sealed and reinforced with tape. 100% WATERPROOF. Perma-Venting system allows cover to breathe, preventing condensation buildup underneath. Soft windshield protector prevents scratching. Aluminized lower panels protect cover from engine and exhaust heat. Elasticised bottom has large high-impact resin grommets for bungee cord (included) and locks.