Virginia - I'm assuming the metal mask is lead lined to prevent Supes from finding out it's Bruce Wayne under there. It wouldn't surprise me at all if the metal cowl is only there until Bats and Supes make nice with each other and become allies.
Battle On,
Deadly Chakram
"Being with you is stronger than me alone." ~ Clark Kent
"One little spark of inspiration is at the heart of all creation." ~ Figment the Dragon
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