Bronze, it's so last region, isn't it? It's weak, it's gaudy. Why, you can do so much better than that. Iron, that's the future: a ferromagnetic cage around your cranium is guaranteed to prevent almost some damage to your squishy brain.
Strangely, none of the residents of Brynmoor wore medium helms: they all went straight for full helms. Probably because they wanted to protect their face from deadly weapons, the cowards.