Helm
The steel head-covering worn during armored combat. The helm must be of at least 16 gauge thickness to comply with Society safety standards, but most serious combatants prefer the thicker 14 or 12 gauge for their great dent-resistance. Historicly helms may have been made from thinner gauges of metal.
See also specific types of helms: barbute, barrel helm, bascinet, Great helm, Phrygian helm, pot helm, sallet, spangenhelm and sugarloaf helm.