First QB helmet designed to help reduce concussions approved
NFL, players' union approve QB-specific helmet designed to reduce concussions – NBC Sports Chicago
First QB helmet designed to help reduce concussions, Sports
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Safety first: Lopers to wear padded caps in practice to prevent concussions
First quarterback helmet designed to reduce concussions approved by NFL
NFL's safest helmet ever may not be enough to stop concussions
Alex Smith Is Wearing a New Helmet Designed to Reduce Concussions
NFL, players' union approve QB-specific helmet designed to reduce concussions – NBC Sports Boston
First quarterback helmet designed to reduce concussions approved by NFL