NFL hopes to reduce head injuries with helmet experiment
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 players experiment with 'Guardian Caps' to protect heads
NFL Players Experiment With 'Guardian Caps' To Protect Heads
Guardian Caps Guardian Sports
NFL hopes to reduce head injuries with helmet experiment – The Morning Call
NFL hopes to reduce head injuries with helmet experiment
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
NFL hopes to reduce head injuries with helmet experiment – The Morning Call
Top football helmet maker explores padded covers, report says