I felt I should add my two cents based on experience. Make sure you use a climbing belt like jch mentioned when setting stands etc. My Hunter Safety Systems vest came with one. I now use one to set stands and then use a HSS life line when hunting. Please be attached from the ground up. The life lines with the prussig(?) knot work slick. Previous to last year, I always just clipped the strap from my vest onto a carabinier on a tree strap above my stand. Last year while moving a stand (not hunting), I learned the hard way. To make a long story short, I ended up in intensive care for a couple nights with broken ribs in my back and a collapsed lung. Coughing up blood wasn't pleasant, but I consider myself extremely lucky. I came down from 18-20 feet and landed flat on my back. The HSS vests are unnoticeable under your outer layers and very comfortable. I'm sure every brand is. Statistically, 30-50 percent of hunters will fall if they hunt regularly out of a tree stand. From what I've read, 70% of those are climbing, getting in, or out of the stand. Again, attach yourself on the ground.