The HSS Lifeline Eliminates the need to move tree straps up and down as you ascend or descend the tree. On your first trip, install the Lifeline above your chosen stand height. Then simply slide the unique Prussic knot up or down the standing line as you move. In the event of a misstep, the Lifeline stops you wherever you happen to be in your climb. The Lifeline offers 100% protection from the ground, to the stand and back again.