We Can Make Football Safer - Scientific American
This Helmet Will Save Football. Actually, Probably Not. - The New York Times
This Helmet Will Save Football. Actually, Probably Not. - The New York Times
New Helmet Technology Aimed to Make Football and Other Sports Safer
Light helmet design's effectiveness pits company versus NFL, NFLPA and their testing - The Athletic
Why aren't more football players wearing the safest possible helmet?
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Riddell's Axiom could be breakthrough helmet for football
Helmet safety: Inside the complicated equipment industry - Sports Illustrated
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Guardian Caps NFL: What player positions are required to wear them?