The safest helmet in football: What's inside the NFL's newest headgear
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An Inside Look at the Riddell Axiom Helmet - Boardroom
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
New Illini Football Helmets Tell a Story About the Program's History - University of Illinois Athletics
New helmet design can deal with sports' twists and turns
New helmet design can deal with sports' twists and turns
Are lighter football helmets safer? Carlsbad company banking on it - The San Diego Union-Tribune
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Are Modern Football Helmets Any Safer than Old-School Leather Ones?, Science
The NFL calls Vicis Zero1 helmets the safest yet
The safest helmet in football: What's inside the NFL's newest headgear
Guardian Caps Guardian Sports
NFL at 100: Helmets go high tech in quest for player safety
EXPLAINER: NFL using helmet caps for player safety, research
3 Ingenious innovations from the NFL's Helmet Challenge
