EXPLAINER: NFL using helmet caps for player safety, research
Denver Broncos release first look of new alternate helmet
Biomechanics, Free Full-Text
It's football season - and that may mean an increase in brain injuries
Future of NFL safety: Inside Vicis' high-tech football helmet production facility in Seattle – GeekWire
The N.F.L. Struggles to Tackle Its Latest Problem: Tackling - The New York Times
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
NFL players experiment with 'Guardian Caps' to protect heads
The Future of NFL Defenses Lies in a Lime-Green Dot - The Ringer
NFL hopes to reduce head injuries with helmet experiment
NFL training camps: Guardian Cap players are wearing over helmets, why
Ex-NFL players six times more likely than the general public to report cognitive problems, study finds - The Boston Globe
Complaints begin regarding Guardian Caps, despite one important hidden benefit - NBC Sports
Can a Better Football Helmet Save Your Kid's Brain? - Washingtonian