The rope is 100% polyester with a braided core covered with a durable braided cover giving the rope the name braid on braid. This construction gives the rope flexibility and durability which makes for good winching and block running. Braid on Braid ropes are pre-stretched for halyard performance and are designed to replace wire/textile rope halyards. These ropes are easily spliceable using hollow fids for forming eyes or for joining ropes.