NFL training camps: Guardian Cap players are wearing over helmets, why
High school football teams go soft in the fight against brain injuries
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
The story behind those soft-shell puffy Guardian Caps players have been wearing
Guardian Caps Guardian Sports
NFL hopes to reduce head injuries with helmet experiment
The story behind those soft-shell puffy Guardian Caps players have been wearing
As NFL mandates Guardian caps in practice, area high school football teams have been using them for years, Sports
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
What are Guardian Caps? Shadow Hills football using new device to reduce head injuries
NFL players experimenting with 'Guardian Caps' to prevent head injuries
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
Guardian Caps Exceed NFL's Expectations - Guardian Sports