NFL players experimenting with 'Guardian Caps' to prevent head injuries
NFL hopes to reduce head injuries with helmet experiment - Seattle Sports
NFL hopes to reduce head injuries with helmet experiment
Can new technology help cut down on concussions? (video)
NFL introduces Guardian Caps across league to limit number of brain injuries in preseason
Safety first: Lopers to wear padded caps in practice to prevent concussions
Guardian Cap - Soft-Shell Protective Helmet Cover : Football Helmets : Sports & Outdoors
NFL report: concussions dropped 50 PERCENT when players wore new 'Guardian Caps' over the summer
NFL players don Guardian Caps, designed to protect from concussion
What are Guardian Caps? NFL's latest padded helmets for added safety
Queen's Football utilizing Guardian Caps - Queen's University Athletics
Padded helmet cover shows little protection for football players - Scope
Guardian Caps Guardian Sports
NFL players wear Guardian Caps to reduce head trauma during training camp