Was putting up a security camera on a spot near the edge of the roof. Since I'd need both hands was concerned might lose balance and go over the side. I'm 6' / 205lbs, this fit me well after a little adjustment. It's kinda tricky to put on at first, I put it on the ground and stepped into it, then pulled it up. After about the 3rd time putting it on it was easier of course since it was adjusted too. This came with a ~6 ft safety rope with clips on it too. I put a big screw eye into a board on the roof about 6' away from where I'd be working then clamped on. This thing held me very securely and was thankful for it.