After a recent cycling trip , I decided to update my blog on bike helmet safety. While cycling with a group in the Netherlands, we suddenly encountered a terrific thunderstorm with marble sized hail lasting what seemed like 30 minutes. We were all wearing bike helmets which protected our heads from the ice pellets. We huddled together and received numerous bruises on our backs and extremities but our heads were protected.
Our helmets had ventilation holes so a few pellets got through but for the most part, our heads were saved from the constant pelting. Wikipedia describes head injuries from large hail and I can believe it.
I now will add protection from hail as another good reason to wear a helmet while cycling.
