Could Guardian Caps be used during NFL games for player safety?, Pro Football Talk
NFL players wear Guardian Caps to reduce head trauma during training camp
NFL Releases Concussion Data After Use of 'Guardian Caps' During Offseason - Sports Illustrated
Coverage of the NFL in Guardian Caps
AYF Members - Special Pricing
Guardian Partners With AYF - American Youth Football
Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries : r/nfl
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
NFL exec suggests Guardian Caps worn to protect players during practices could one day debut in games
AYF is proud to have - American Youth Football and Cheer
Could Guardian Caps be used during NFL games for player safety?, Pro Football Talk