Guardian Cap Results: “Exceeded Our Expectations”
NFL hopes to reduce head injuries with helmet experiment
Helmet Innovation: More and Better Choices, Fewer Concussions
Exactly How Dangerous Is Football?
EXPLAINER: NFL using helmet caps for player safety, research
Targeting: College football's hard-to-define penalty
Guardian Caps: Why some NFL players are wearing them in training
EXPLAINER: NFL using helmet caps for player safety, research
NFL's use of Guardian padded helmet caps in camp draws support and
Coverage of the NFL in Guardian Caps
Biomechanics, Free Full-Text
NFL CMO Dr. Allen Sills explains importance of mandated guardian
Helmet hits causing more than just concussions - The Boston Globe
In Brawl For Seau Brain, a Proxy War Over Concussion Science