I crashed last week and hit my head pretty hard on the road. Had a mild concussion and am nearly back to 100% a week later. Thank goodness for my helmet!! I was wearing a Giro Ionis that I got from Bicycle World of Houston. If it weren't for my helmet my head probably would have cracked right open. The outside of my helmet dented and there were two cracks on the inside. It definitely did it's job!!! A few days after my crash I went over to BWH to see about getting a new helmet and they gave me a pretty good deal on a replacement. Thank you guys!!! Always always always wear your helmet!!!!