 Some "asbaran" units such as mercenaries may have worn little to no armor at all, allowing them to be rather more swift, silent, and mobile.The Spangenhelm helmets worn by members of the "asbaran" units in battle would have evolved through the centuries.During the 3rd-to-6th-century era of the Sassanian empire, the "Spangenhelm " would have probably been made of felt and hardened leather.