The marine grade vinyl coated fabrics resist fading Heavy duty, self-correcting zippers for smooth operation Color matched wick stop thread to seal the stitching holes Built to factory original quality specifications to ensure a proper fit Upper Door Must Be Square. Does not fit rounded upper doors. This is a genuine factory style replacement product with full manufacturer warranty & support. Constructed from the upgraded specialty fabric that stretches for fast installation and returns to its original shape for tautness. It allows you to open your tailgate without opening the rear window. Features DOT approved windows, over-sized zippers, and factory-spec velcro, thread, webbing, and door seals. Sierra Offroad replacement soft tops require use of your factory-original top frame and hardware. It may be used with aftermarket hardware designed as a factory original replacement. Designed and manufactured to directly replace the factory original soft top and requires a factory original or factory style frame.