Roman Troopper Helmet With black plume By Nauticalmart This helmet replica is formed from 18 gauge steel to match the originals. The formidably tough Roman Legionnaire marched triumphantly from the cold mists of England to the hot, dry plains of the mid-East relying on a helmet for head protection. It is speculated that the plume whilst magnificent was impractical on a day-to-day basis and therefore used mainly only for parade.