Just decided to bump this thread up for 2010. A bud of my got blind sided just this last weekend at the local hill. Temps finaly hit the teens above zero and the hill was busy. He was hit from behind, and ending up going to the ER for a CAT scan. He is very sore today, but does not have a concussion. Sadly, I have been without a helmet for 3 years. I will be picking up one tonight at the local board shop. Be safe!