Anything but a belt or shoulder only type harness, aka full body. I don't treestand hunt much anymore but whenI doI use a lineman's full bodyharness, it's a snap to put on basically step in pull opver shoulder and sinche it up. I use it when working on heavy pitched/high roofs and I can say it does work like its suppose too[:-]! It may not be camo and cost a few bucks more then the stuff you see at cabelas but IMHO it is very cheap insurance. I have a wife and kids so I wouldn't climb into a tree without one any longer.