Many of you may have used hitch cords with two sewn eyes. Some in the USA are made of a technora external sheath on polyester or nylon core. Two names are Tech VT by Atwood Gear or VT Prusik by Bluewater Ropes. They are used to tie a Valdotain Tresse hitch made popular in France and now used by arborists in the USA. There are many other varied uses for this device in caving, canyoning, rock climbing and technical rescue. There are a few ways to tie it as a releasable under load hitch. In this video () are two ways that are very similar. Both are releasable under load. Trying to release a Valdotain can be challenging. It can release either too fast or not at all. Paul Stovall and I did some backyard testing. We used both prusiks from Bluewater and Atwood. We tied them on 11 mm nylon caving rope, Sterling CIV canyon rope and Imlay 9 mm polyester canyon rope. We tried various configurations such as four vs. three wraps, the VT or XT method, then a few or many crosses. Paul weighs about 200 pounds. He subjectively rated the XT vs. VT as to how easy it was to control the release. Enough iterations were run to clearly point toward the XT method as best. However which method is best is ultimately dependent on personal preference and many factors with the rope and/or cord; dry or wet, clean or dirty, old or new, the material made of, etc. It would be informative for others to do their own backyard testing and chime in on this discussion.