Oceanweave 600D reclaimed fishnet polyester with waterproof polyurethane coating. - 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.