How to Find the Best Field-Use Helmet for You – Green Gridiron, Inc.
Why aren't more football players wearing the safest possible helmet?
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
NFL helmet safety testing results: Vicis ranks first again for its high-tech head protector – GeekWire
Several NFLers to wear new VICIS helmet designed for linemen
Players Just Wore This Startup's New Soft Helmets in an NFL Preseason Game
Casa Grande High School To Outfit Entire Football Roster In VICIS ZERO1 Helmets
NFL star Russell Wilson invests in high-tech helmet maker Vicis as total funding nears $50M – GeekWire
How Vicis Built The Zero1, The Futuristic Football Helmet Saving the NFL
Doug Baldwin: No reason for NFL players not to wear safer helmets