Guardian helmet caps are being used to mitigate concussion issues
It's time the NFL made Guardian Caps mandatory
What are those funny-looking soft caps on NFL helmets during camp?, Sports
NFL hopes to reduce head injuries with helmet experiment - Seattle Sports
Unpopular guardian caps could provide false sense of security
NFL concussion data could lead to broader use of Guardian Caps - NBC Sports
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
NFL players experimenting with 'Guardian Caps' to prevent head injuries
Guardian cap' to prevent head injuries mandated for practices, CFL says
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Oklahoma Sooners Continue to be Proactive in Player Safety With Guardian Caps - Sports Illustrated Oklahoma Sooners News, Analysis and More
John's Journal: Park Football Team Is All In On Concussion Safety, News