What are the black bars beneath American Footballer's eyes are used for? - Sports Stack Exchange

I often see football players with black bars right under their eyes. I can't figure out a reason why they are necessary. What are they used for?

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Why Do Football Players Wear Black Paint Under Their Eyes?

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Who is the greatest American football player from the NFL or earlier leagues that most people, even big fans of the sport, don't know much about? - Quora