The Coat of Arms Added Protection or False Security: Football Tests New Guardian Caps to Prevent Concussions
Guardian Caps Guardian Sports
Queen's Football utilizing Guardian Caps - Queen's University Athletics
Chicago Bears: Why players are wearing padded helmets
If a player wanted to wear a Guardian Cap during a game, the league would prohibit it - NBC Sports
NFL introduces Guardian Caps across league to limit number of brain injuries in preseason
EXPLAINER: NFL using helmet caps for player safety, research
It's time the NFL made Guardian Caps mandatory
The Coat of Arms Discussion: How are Serious Concussion Issues Changing Football?