There are a few studies about the probability and severeness of accidents with bikers and helmets. The gist: wearing a helmet will slightly lower the severeness

There are a few studies about the probability and severeness of accidents with bikers and helmets. The gist: wearing a helmet will slightly lower the severeness, but will rise slightly the probability. Best overall protection: a blonde, long haired wig. Edit: of course on streets. Biking down a mountain etc are different.