Cost of a Clemson football uniform: Helmets, shoulder pads big expenses
How the NFL Fleeces Taxpayers - The Atlantic
Guardian Caps Guardian Sports
Built By Data: NFL Helmet Innovation
A Helmet Shortage Is Hitting High School Football Across the Country - The New York Times
The N.F.L.'s Favorite Helmet Maker Is in Financial Trouble - The New York Times
Super Bowl players' custom helmets start with a 3D scan
NFL permitting players to display social justice messages on helmets this season - The Boston Globe
EliteTek Football Helmet Visor - Universal Fits Youth & Adult Helmets, Different Colors
Inside Slant: Re-imagining NFL helmets - ESPN - NFL Nation- ESPN
NFL helmet lower rule: Explanation of new regulations - Sports Illustrated
NFL's Safest Helmets Absorb Impact With 3D Printing Instead Of Foam