Strong .310 big wave urethane cord, Stress Relief Molded Cord End: A strong durable connection - Soft, Flexible Ankle Cuff: Double layered neoprene - Double Swivel: Reduces tangling - Short, Detachable Rail Saver: Keep leash actual size - Key Pocket: Use it or not it's there - Molded Stand Off: Keeps cord away from feet - Stainless Steel Hardware: No corrosion - Easy Grab Pull: Rider designed and practical.