Cebus Capucinis

It might be helpful if a bird flies in to your head or you land in a tree and hit a branch.

Hmm, fair point. And if a bird does smack one of them, I'd want the GoPro so we can see it recorded for posterity! My position is officially changed! Helmets for all BASE jumpers!

Not what you're talking about, I know, but I do remember hearing (a long time ago) about a guy who's chute failed and he hit trees, Pine trees I think;  and the branches broke his fall and he ended up surviving with just a broken ankle.