What to Look for In a Football Helmet
Brand and Age of Football Helmets Make No Difference in Concussions
Revolutionary new ZERO1 football helmet may help NFL players reduce concussions
This Helmet Will Save Football. Actually, Probably Not. - The New York Times
League of Denial: The NFL, Concussions and the Battle for Truth by Mark Fainaru-Wada
Nevius: NFL wants to go global, but will it translate?
Built By Data: NFL Helmet Innovation
NFL, NFLPA working hard to improve player safety
Football's Concussion Crisis Is Awash With Pseudoscience
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
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: 3 QBs sidelined by concussions on 1 day – The Mercury
Football helmets are creating more problems than they solve