Foam?
And welcome to the TreeHouse, Shanexv! Four years in treework? You must be an Expert, like I was, back then!
Haha now I wouldn't say that. Back when I was in highschool a friend and I started doin groundwork with a man in my town that's done tree work for almost 40 years. Started climbing right around the time I graduated in 09, I'm 20 now and stay pretty busy doing jobs around here, there's not many reputable tree people here and it's pretty hard to stay busy all the time seeing that no one here cares about their trees until they are so rotten you can push them over.
Faaaaaaaarrrrr from expert but doing everything I can to learn!