Have you ever seen a professional cyclists or a MTB world champions race without wearing a helmet? There is a valid reason why the international regulations have made it mandatory to wear a helmet approved in any event being it on the road or on MTB, and this precaution is also indispensable for non-professional athletes. A helmet on your head can make a difference in the unfortunate event and after a few exits you wont think twice but to wear one. Beyond that - let's face it - it makes you look more "serious" and thanks to the wide range available, it can easily be combined with the colours of the bike or clothing.