NFL safety: How VICIS' position-specific helmets have become all the rage - The Athletic
Riddell's Axiom could be breakthrough helmet for football
NFL at 100: Helmets go high tech in quest for player safety
First position-specific helmet ranks No. 2 in NFL lab testing - NBC Sports
Joe Burrow switches to the new quarterback-specific helmet from Vicis - NBC Sports
NFL To Introduce New Football Helmets - Big Blue View
First QB helmet designed to help reduce concussions approved by NFL, NFLPA
NFL to test new position-specific helmet designed for linemen
First QB helmet designed to help reduce concussions approved
NFL at 100: Helmets go high tech in quest for player safety
Future of NFL safety: Inside Vicis' high-tech football helmet production facility in Seattle – GeekWire
VICIS ZERO1, Protect the athlete, elevate the game
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets