Guardian Caps Guardian Sports
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
Concussions: Can cap keep football players' heads in game? – Orange County Register
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
Can new technology help cut down on concussions? (video)
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
The Scoop - Monday January 31, 2022 - Footballscoop
More Guardian Caps, And '0' On The Field
Guardian cap' to prevent head injuries mandated for practices, CFL says