NFL Players Experiment With 'Guardian Caps' to Protect Heads – NBC Connecticut
Raiders, other NFL teams wear Guardian Caps for head safety, Raiders News
Guardian Cap Debuts at Training Camps League-wide
NFL Presents: League-wide Guardian Cap Use to Reduce Head Impacts
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
The 2018 Injury Reduction Plan: Initiatives to Advance Player Health and Safety
New York Jets coach Robert Saleh says he's concerned over use of new protective helmet shells - ESPN
Tony Plagman on LinkedIn: NFL mandates special helmets for start of camp
NFL Players Experiment With 'Guardian Caps' to Protect Heads – NBC Connecticut
Guardian Caps Guardian Sports
Coverage of the NFL in Guardian Caps
NFL Mandates Guardian Caps >> Guardian Sports
NFL's handling of concussions questioned after Tua's injury
Coverage of the NFL in Guardian Caps
Concussions Dropped More Than 50 Percent for Players Who Wore Guardian Caps, NFL Says, News, Scores, Highlights, Stats, and Rumors