Oceanweave 600D reclaimed fishnet polyester with waterproof polyurethane coating. Water-resistant stitched construction. Heavy duty seat rail buckle and straps pull up to tighten. 3 rubberized modular seatpost straps with Camlock ensure things stay tight while eliminating potential damage to clothing. Top mount bungee system with wings provides optimum stability to top loads etc. Top bungee system for additional flexible storage. Supplemental rear closure strap system provides additional support. Ultra-visible rear 3M triangle logo. Polypropylene plates below saddle ensure ample leg clearance even if heavily loaded. Built in U-lock holder and rear light clip