X2E+ Varsity Xenith Football Helmets, Shoulder Pads & Facemasks
Quantitative evaluation of impact attenuation by football helmets using a modal impulse hammer - Brian Cummiskey, Goutham N Sankaran, Kevin G McIver, Daniel Shyu, Justin Markel, Thomas M Talavage, Larry Leverenz, Janette
History of The Football Helmet - Atavus
Football Helmets for 2017 - Riddell and Schutt Helmet Technology
Uni Watch: New F7 design is latest round in helmet arms race
Future of football safety could come down to research in Riddell's suburban Chicago office
NFL helmet safety testing results: Vicis ranks first again for its high-tech head protector – GeekWire
For former NFL player Doug Baldwin, embracing newer helmet technology was a no-brainer
The future of football helmets is driven by innovation and a startup culture - The Athletic
Making Football Safer: Assessing the Current National Football League Policy on the Type of Helmets Allowed on the Playing Field