I climb telephone poles for a living.....take it from me....the tree sling is good in theory but you won't want to hang in it for hours....not only will it cut into you and make you uncomfortable, you'll be squirming your feet alot...regardless if your standing on tree branches which is dangerous or using tree gaff's like we use to climb poles...they cut into your feet even with the best climbing boots and make your toes go numb.