The material used for making viking helmet was tight-fitting leather or metal.
They certainly wore helmets but they would have been simple skullcaps, designed to protect the head from impact.
Having a pair of horns on your head in battle would not have been helpful if warriors were striking at you with clubs, swords or axes.
Viking helmets could have been made of non-metallic materials and perhaps they decayed over time. These helmets would not offer much head protection. Vikings did not wear metal helmets.
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