Future of NFL safety: Inside Vicis' high-tech football helmet production facility in Seattle – GeekWire
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
Aaron Rodgers explains why he's now at peace with the Packers - Sports Illustrated
Complaints begin regarding Guardian Caps, despite one important hidden benefit - NBC Sports
Rising concussion awareness leads one high school to invest in high-tech football helmets, Sports
Guardian Caps: NFL Requires Use Of Helmet Cover At Training, 46% OFF
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Head Injuries & American Football - Ethics Unwrapped
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
What Does A Safety Do In Football? Explained – vIQtory Sports
Explanation: NFL using helmet caps for player safety, research
NFL training camps: Guardian Cap players are wearing over helmets, why
NFL hopes to reduce head injuries with helmet experiment