Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
Concussions among players who wore Guardian Caps over summer dropped more than 50%, NFL says - ESPN
NFL report: concussions dropped 50 PERCENT when players wore new 'Guardian Caps' over the summer
Guardian Cap Debuts at Training Camps League-wide
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
NFL exec suggests Guardian Caps worn to protect players during practices could one day debut in games
NFL training camps: Guardian Cap players are wearing over helmets, why
NFL players experimenting with 'Guardian Caps' to prevent head injuries
Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
Jaguars edge Titans for playoff spot after Chiefs thump Raiders for AFC's top seed, NFL
NFL report: concussions dropped 50 PERCENT when players wore new 'Guardian Caps' over the summer
NFL fans blast league over Guardian Caps following Jets HC Robert Saleh's criticism