Concussions among players who wore Guardian Caps over summer dropped more than 50%, NFL says - ESPN
Changing the COVID rules will help the NFL on the field, but will it be safe for players? - The Boston Globe
Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
NFL introduces Guardian Caps across league to limit number of brain injuries in preseason
Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
NFL training camps: Guardian Cap players are wearing over helmets, why
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Dabo Swinney calls Hunter Johnson 'Boomerang' after QB's return to Clemson
NFL training camp 2022: Why are players wearing Guardian Caps?
NFL fans blast league over Guardian Caps following Jets HC Robert Saleh's criticism
NFL training camps: Guardian Cap players are wearing over helmets, why
NFL fans react to new guardian cap rules
NFL expands rule against misuse of helmet; Guardian Caps required in regular season, postseason