Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Virginia Tech lab releases first safety ratings for youth football helmets
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
Built By Data: NFL Helmet Innovation
Tennessee Football Orange helmets announced ahead of South Carolina game
EXPLAINER: NFL using helmet caps for player safety, research
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Helmet Cameras Would Put NFL Fans in the Middle of Everything
Head Injuries & American Football - Ethics Unwrapped
Can a Better Football Helmet Save Your Kid's Brain? - Washingtonian
Bellmore-Merrick athletics debuts new guardian caps, Herald Community Newspapers
The link between head injuries and CTE in football, explained - Vox
Future of NFL safety: Inside Vicis' high-tech football helmet production facility in Seattle – GeekWire
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
EXPLAINER: NFL using helmet caps for player safety, research