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?
Antonio Rüdiger Joins Under Armour Roster
What are the black bars beneath American Footballer's eyes are used for? - Sports Stack Exchange
Dele Alli, Sergio Aguero and Ronaldinho all dated daughters of iconic footballers, Football, Sport
100,000 American football Vector Images
Baseball Eye Black Designs - Applied Vision Baseball
Eye black - Wikipedia
Jack Beasley Foundation
How a Soccer Star Is Made - The New York Times
Pelé dies aged 82: tributes paid to a football great, Pelé
50 Greatest South American Footballers of All Time - Sports Illustrated
What is the Q Collar, the device NFL players are wearing around their necks