Head Injuries & American Football - Ethics Unwrapped
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
Can a Better Football Helmet Save Your Kid's Brain? - Washingtonian
The Coat of Arms Added Protection or False Security: Football Tests New Guardian Caps to Prevent Concussions
The link between head injuries and CTE in football, explained - Vox
EXPLAINER: NFL using helmet caps for player safety, research