Riddell launches Axiom, latest helmet to combat concussions
NFL Enters Next Era of Helmet Safety with Advent of Quarterback-Specific Helmet
Finally: First QB Helmet Designed To Reduce Concussions Has Been Approved by NFL
Football's Concussion Crisis Is Awash With Pseudoscience
Revolutionary new ZERO1 football helmet may help NFL players reduce concussions
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NFL, NFLPA approve concussion-reducing helmet for QBs
First QB helmet designed to help reduce concussions approved
First QB helmet designed to help reduce concussions, Sports
First QB helmet designed to help reduce concussions approved - WTOP News
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
First QB Helmet Designed To Help Reduce Concussions Approved
QB helmet designed to reduce concussions approved by NFL - The Iola Register
Jeremy Repanich: Helmets alone won't save football from concussions - Sports Illustrated