Leatherhead to Radio-head: The Evolution of the Football Helmet, Arts & Culture
NFL Enters Next Era of Helmet Safety with Quarterback-Specific Helmet
All the details of the new air-conditioned football helmets that athletes love
The Football Helmet Just Got the Biggest Redesign Since the 1960s--and It's Coming to the NFL Next Season
We Can Make Football Safer - Scientific American
Guardian Cap Debuts at Training Camps League-wide
EXPLAINER: NFL using helmet caps for player safety, research
This Helmet Will Save Football. Actually, Probably Not. - The New York Times
What are Guardian Caps? NFL players sport specialty helmets for 2022 minicamp
The N.F.L. Struggles to Tackle Its Latest Problem: Tackling - The New York Times
How Engineers Are Making Football Helmets Safer