Steelers debut new, safer helmets for off-season training
Inside Training Camp: Everything Changes When the Pads Go On, News, Scores, Highlights, Stats, and Rumors
NFL players don Guardian Caps, designed to protect from concussion
What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
Coronavirus: NFL suggests face shields on helmets - Los Angeles Times
How the NFL plans to play a season during the pandemic
Eagles training camp 2022: Why Jason Kelce wore bubble wrap at practice – NBC Sports Philadelphia
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
Giants react to NFL's new 'Guardian Caps' at training camps - Big Blue View
NFL hopes to reduce head injuries with helmet experiment
N.F.L. Gives Lower-Body Padding a Tryout - The New York Times