I recently got a concussion from playing hockey- I think it's time for a new helmet. I was looking at a new-ish helmet that claims to have superior protection than the others but a video promo for it was sort of unsettling for me:http://www.youtube.com/watch?v=yAV99h1Aeg0e. At around 3:00 it shows the helmet being crushed along with the competitors' helmets being crushed. It claims that because it takes more force to crush this helmet, it is safer. Could someone explain why this is? To me it seems like the 'give' the other helmets have would help to cushion the blow, whereas this helmet would just transfer the force directly to my head since not as much energy is used up to distort it. I thought that was the guiding principle for building those cars that crumble upon impact- slower change in momentum means it's less violent?