3 Ingenious innovations from the NFL's Helmet Challenge
This Helmet Will Save Football. Actually, Probably Not. - The New York Times
The future of football helmets is driven by innovation and a startup culture - The Athletic
Why Is It So Hard to Stop Sports Concussions?
Making football helmets safer to prevent concussions
Football Helmets Do Little to Protect Against Concussions: Study
Concussions And Repercussions, Part Two: Can Technology Beat Head Injuries?
New Helmet Liner May Reduce Football Concussions
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN