Florio PFT] The Guardian Cap apparently works. But if a player asks to wear it in a game, the league would say no. : r/nfl
NFL hopes to reduce head injuries with helmet experiment
Guardian Cap Debuts at NFL Training Camps League-wide
NFL Introduces Guardian Caps At First Week Of Training Camp - The Sports Credential
As NFL mandates Guardian caps in practice, area high school football teams have been using them for years, Sports
NFL hopes to reduce head injuries with helmet experiment
Ban on helmet covers sparks controversy
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
Guardian Caps: Why some NFL players are wearing them in training camps
Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety
NFL exec suggests Guardian Caps worn to protect players during practices could one day debut in games
NFL hopes to reduce head injuries with helmet experiment – The Morning Call
NFL players experiment with Guardian Caps // Guardian Sports
Concussions: Can cap keep football players' heads in game? – Orange County Register