I've thought for a while now the helmets should actually be smaller. They should be strong enough to prevent a head injury, but thin enough to where it's at least very uncomfortable to get hit in the head. That's a huge part of the problem. These guys have no reservations throwing themselves head first into contact because most of the time they don't even feel it, even though their brain is still repeatedly smashing around in their skull. Even if they don't get an obvious concussion, that repeated impact over several years adds up.