The most obvious and easiest answer if you've got a head injury is a better helmet. The problem is there's no evidence that it is the answer. I've watched a couple equipment manufacturers make presentations. They're very slick. They're very well done. And they usually start with the same disclaimer: there is no evidence that helmets reduce the frequency of concussions. You come away going "isn't this amazing?" It's so amazing you forget the opening line, that it doesn't do anything. It has no impact on concussions.