NFL hopes to reduce head injuries with helmet experiment
Garber Dukes to wear Guardian Caps during football practices
Could Guardian Caps be used in games? - NBC Sports
In fall camp, Montana State using Guardian Caps for safety, preservation of game
What are Guardian Caps? Shadow Hills football using new device to reduce head injuries
As NFL mandates Guardian caps in practice, area high school football teams have been using them for years, Sports
NFL players experiment with 'Guardian Caps' to protect heads
NFL Presents: League-wide Guardian Cap Use to Reduce Head Impacts
Guardian Caps Guardian Sports
The impact of 'Guardian Caps' on player safety
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
NFL Mandates Guardian Caps During Training Camp - Team Insight