Badgers wearing Guardian Caps to limit concussions during practice
Truth About Guardian Caps
NFL: Concussions dropped by more than 50% among players who wore
NFL on FOX - Guardian caps have significantly helped with the
What is the NFL guardian cap and how does it work? – NBC Sports
NFL players don Guardian Caps, designed to protect from concussion
Guardian Caps: The new helmets worn by several NFL teams
NFL exec suggests Guardian Caps worn to protect players during
NFL introduces Guardian Caps across league to limit number of
NFL exec suggests Guardian Caps worn to protect players during
Coverage of the NFL in Guardian Caps