IcePick
ArboristSite Operative
Most guys at our company like the vertex or whatever you call them because they say their heads can breathe a bit better and they don't sweat as bad. The pacifics are bulky and heavy, and make me sweat like a hog, but being Kevlar and working in the hood every once in a great while, I suspect they can deflect a bullet as well as a falling or swinging log/branch.