Connects to your rescue PFD and enhances kayak towing performance Shock-loaded tubular webbing with a stainless steel O-ring The stainless steel O-ring includes a hook patch of "hook and loop" material that facilitates centering of the O-ring on vests that have the loop material sewn on in the back. Nuq Twist Lock Carabiner prevents accidental snag on brush in the field or with other gear. Short tether stretches 19 - 33 inches, Long tether stretches 33 - 53 inches NRS Kayak Tow Tether - The NRS Tow Tether, sometimes called a cow tail, connects to your rescue PFD and enhances boat-towing performance in rescue situations.