NFL, NFLPA release results of annual helmet testing: Three previously approved models now prohibited
New NFL quarterback helmet aims to help combat concussion effects
Seattle's VICIS is bringing its helmet tech to youth football, forcing teams and parents to confront cost
Regular Season Game 9 - Chiefs vs. Vikings (11-3-19) by Kansas City Chiefs - Issuu
NFL star Russell Wilson invests in high-tech helmet maker Vicis as total funding nears $50M – GeekWire
Guardian Caps Guardian Sports
Helmet manufacturer Vicis is running out of cash - NBC Sports
Joe Burrow switches to the new quarterback-specific helmet from Vicis - NBC Sports
First QB Helmet Designed To Help Reduce Concussions Approved