X-Stand Treestands Safe Climb uses a Prusik knot the same knot used by mountain climbers to ensure hunters stay safely secure from the moment their feet leave the ground. The Prusik knot slides up and down 30 ft. of nylon climbing rope as you travel up to your stand or from your stand back down to the ground, and immediately cinches tight to catch you should an unexpected fall occur. Easily supports up to 500 lbs. Three-Pack includes a heavy-duty locking carabiner. Available: Single Three-Pack A Video Public Service Announcement from the TREESTAND MANUFACTURERS ASSOCIATION Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Treestand Lifelines.