NFL safety: How VICIS' position-specific helmets have become all the rage - The Athletic
Why Jason Pinnock won the Giants' second starting safety job - Big Blue View
Pro and con: Is football too dangerous for kids? - WHYY
Touch Football, Sold as Safer, Now Requires a Helmet - The New York Times
NFL Health and Safety Fact Sheet
Shadow Varsity Xenith Football Helmets, Shoulder Pads & Facemasks
Football helmet with liquid padding may prevent concussions
Newer football helmets could slash concussion risks, study suggests
A Helmet Shortage Is Hitting High School Football Across the Country - The New York Times
Helmets don't eliminate concussions. It's time for the NFL to ditch them, NFL
Touch Football, Sold as Safer, Now Requires a Helmet - The New York Times
NFL players don Guardian Caps, designed to protect from concussion