For down stances: Is this the end of the line? - Sports Illustrated
NFL to test new position-specific helmet designed for linemen - ESPN
BRP BV2S Snowmobile Helmet Concept
D-III program to offer every player on roster football's top-rated helmet - Footballscoop
VICIS and Carbon Combine Technologies to Create Top-Rated Helmets - Carbon
James Sauerbaum on LinkedIn: VICIS x Carbon
Amid NFL-wide concussion concerns, 2 Bears embrace new kind of helmet - Chicago Sun-Times
VICIS creates the first football helmet designed specifically to better protect linemen
Varsity Football Helmet Ratings
The Safest Football Helmet Is Not Yet a Hit in the NFL - WSJ
Vicis high-tech helmets take top 3 spots in NFL's annual performance ranking of equipment – GeekWire
How many types of helmets are there in the NFL? - Quora
Why does it appear that NFL players on the same team wear two different types of helmet? Does it have to do with the position they play? - Quora