(Big time tangent: I'm in the same boat, so to speak, when it comes to Vikings.  In my mind they will always have horned helmets.  I know there is no historical evidence for this, and that it would have been wildly impractical to wear them in the close quarters of a ship -- they'd be poking each others' eyes out left and right. 

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Funnily enough, something like that passed thru my mind watching AMAZING SPIDER-MAN last night. Of course, the movie contrives to get the actor's face out on screen as often as possible, but they are mostly quite clever about it. In one scene, laying a trap for the Lizard, Spider-Man reclines at the center of a web he's spun -- and has his mask off. Which seemed quite logical, when I thought about it. It really would not be comfortable to wear that full face mask ALL THE TIME, as it would not be comfortable to wear a heavy metal helmet at all times.