POLYETHYLENE RIP STOP TARP. These tarps are cut to size. The finished size is cut one size less seams, hems, and turnovers. They are fabricated out of Flextuf Rip Stop Polyethylene, the modern replacement for canvas. They are bright blue with Sisal rope inside hem. There are grommets every 3 feet, and are waterproof and tearproof. 5 oz. polyethylene.