NRS Kayak Tow Tether - 33” The Kayak Tow Tether by NRS is a strong tether with a built-in bungee is used with the quick-release harnesses on rescue PFDs. The tether enhances towing performance in rescue situations. The stainless 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. It also has a hook patch on the carabiner end. This mates with a loop piece available on some rescue PFDs, forming a quick-release holder for the carabiner.