The Anglers Choice Bo-Slo Drift Anchor is made of heavy-duty, cord-enforced vinyl that is hand sewn and double stitched for durable performance. Its funnel-shaped sock has a thick nylon web wash-through hole with a collapse/tab loop at its small end. The huge opening end is web-enforced and has a box sewn to three heavy-duty tow straps. This drift sock for 18-21 boats also has joined tripod tow straps to form the tow loop connection to the rope.