Football helmets with outside padding get tryout at Bremerton High School
The NFL Has Introduced 'Guardian Caps' to Reduce Concussions, and Made Them Mandatory. But Only for Some Positions. And Only Through the 2nd Preseason Game.
Padded helmet cover shows little protection for football players - Scope
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
What are Guardian Caps and how are they helping football teams?
NFL hopes to reduce head injuries with helmet experiment - Seattle Sports
Guardian Cap: What are and why the NFL asks this safety measure in helmets
Xaverian High in Mass. introduces Guardian Caps for football players
Guardian Cap used by football teams to protect against head injury – The Denver Post
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
NFL training camp 2022: Why are players wearing Guardian Caps?
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic