Talking to the founder of Orange Aid a few years back, whos son is a neurosurgon and he let me in on a secret which I have posted here before. A standard pine 2x4 will pass the SFI test for rollbar/interior padding. In other words it is junk. I watched Eric from Alaska try and bend some JAZ stuff that had been sitting in the sun all day and it broke like a 3 day old breadstick. ISP, and others are at least working with better options. I strongly feel there is a lot of room for improvement here with the technologies we have today. Things like Zoombang that are energy dissipating and such.