NFL thinks some face masks encourage players to use their heads - NBC Sports
NFL not expected to require players to wear face shields
The benefits of wearing football gloves
Safety, toughness, technology collide at softball fielder's masks
The Green Bay Packers Love Jordan Love. The Fans Are Starting to, Too. - The Ringer
Tuesday update: The NFL has banned these 'non-standard' face masks - Footballscoop
NFL is testing face masks that contain surgical or N95 material - The Washington Post
RIP-IT Original Defense Softball Fielder's Mask, Youth, Black
Could NFL players wear masks during the 2020 season? Lingering coronavirus-related questions - ESPN
Why do football players who play different positions use different facemasks? - Quora
Pro Football Journal: Facemask Oddities