Guardian Cap Debuts at Training Camps League-wide
NFL 2023 Season Guardian Caps Mandate Supported By 52% Concussion Drop – Sports Techie
Park High School football blazes safety trail with Guardian Caps
Guardian Caps: Why some NFL players are wearing them in training camps
Can new technology help cut down on concussions? (video)
Concussions: Can cap keep football players' heads in game? – Orange County Register
Concussions: Can cap keep football players' heads in game? – Orange County Register
EXPLAINER: NFL using helmet caps for player safety, research
NFL hopes to reduce head injuries with helmet experiment