Hunter Safety Lifeline System Safety Harness (3-Pack) TIME-TESTED AND PROVEN: Once properly installed, our HSS-LIFELINE keeps you connected from the ground to the treestand and back again. EASY TO SET UP AND USE: Attach tether to carabiner and slide the Prusik knot up to ascend and slide it back down when descending. VERSATILE: All Lifelines accommodate treestands up to 30 feet high. EASY TO FIND IN THE DARK: New 2015 version features reflective material that lights up with the slightest flashlight beam to locate your stand in low-light conditions. SILENT ASCENT AND DESCENT: New 2015 design features cowbell silencers that eliminate any clanking noises from carabineers that might scare game.