Sorry to hear about you jostling your brain,TB. I knocked myself out-cold two years back in the terrain-park on a Prior 181 WCR(alcohol may have been involved)....I had a killer headache for a week straight,so I'm assuming I had some sort of concussion.Anyway,My doting mother buys me a helmet last Xmas that I won't wear due to poor fit.I really have to stop talking about it and just buy one I like.I make my two kids wear 'em while skiing......time to stop being a hypocrite and find one that fits my noodle.