What Pros Wear: Top 5 Helmets Rated by the NFL & NFLPA - What Pros Wear
The NFL calls Vicis Zero1 helmets the safest yet
The Zero1 Flexible Football Helmet May Save Players' Brains
The N.F.L.'s Favorite Helmet Maker Is in Financial Trouble - The New York Times
NFL helmet safety rankings: Seattle startup Vicis tops list again with high-tech head protector – GeekWire
Top-testing helmet used by small number of players
Behind the downfall of helmet darling VICIS: Market barriers, eroding cash and a '$1,000 paperweight' - The Athletic
This Startup's 2 Helmets Are Officially the Safest in Football, According to the NFL
NFL and players union announce new quarterback-specific helmet to combat concussions - WSVN 7News, Miami News, Weather, Sports
The VICIS ZERO1: Engineering a Safer Football Helmet - GrabCAD Blog
Antonio Brown's Helmet Standoff Nears a Conclusion - The New York Times
Virginia Tech Ranks the VICIS Zero1 as the Safest Youth Football Helmet