My son has been using a regular off road helmet and goggles. He needs a new helmet and is asking for a full face helmet with a full face shield, the type motorcycle riders wear. I am deciding if I should let him switch as it seems to me that there has to be some safety advantage of the off road type or dirt bike riders and ATVers would have just used the motorcycle helmets. Am I right or does it make no difference. I want every safety advantage I can get for him.