NFL says positions wearing Guardian Caps saw 52% decrease in concussions - NBC Sports
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
The story behind those soft-shell puffy Guardian Caps players have been wearing
What are Guardian Caps? Shadow Hills football using new device to reduce head injuries
NFL: Concussions dropped by more than 50% among players who wore Guardian Caps during summer
This might be a dumb question, but why do they wear these extra pads on their helmets for camp but remove them for games? : r/KansasCityChiefs
Coverage of the NFL in Guardian Caps
Coverage of the NFL in Guardian Caps
Why Alabama football players are wearing padded helmets in practice
For Giants and the NFL, it's the Summer of Guardian Caps - Newsday
NFL players wear Guardian Caps to reduce head trauma during training camp
Guardian Caps Guardian Sports