High school football teams go soft in the fight against brain injuries
Guardian Caps: Why some NFL players are wearing them in training camps
NFL's Guardian Caps leave mixed reviews among teams including Eagles
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
Coverage of the NFL in Guardian Caps
Why Alabama football players are wearing padded helmets in practice
These puffy helmet caps are the next big thing in NFL player safety, National Sports
The story behind those soft-shell puffy Guardian Caps players have been wearing
Guardian Caps Guardian Sports
Guardian Caps Guardian Sports
What are Guardian Caps? NFL's latest padded helmets for added safety
NFL hopes to reduce head injuries with helmet experiment
NFL CMO Dr. Sills on Guardian Caps Mandate >> Guardian Sports