Guardian Caps: Why some NFL players are wearing them in training camps
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
Guardian Cap Use a Concern for Watt, Saleh Early in Training Camp - Sports Illustrated
Guardian Cap - Soft-Shell Protective Helmet Cover : Football Helmets : Sports & Outdoors
Bombers set to don Guardian Caps” on helmets at training camp
Why Alabama football players are wearing padded helmets in practice
Guardian Caps: Why some NFL players are wearing them in training camps
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Coverage of the NFL in Guardian Caps
First QB helmet designed to help reduce concussions approved by NFL, NFLPA
NFL players beginning to adopt protective Guardian Caps over helmets at practice - NBC Sports
NFL Players Experiment With 'Guardian Caps' to Protect Heads – NBC Connecticut
Tennessee football: UT Vols use Guardian helmet covers
What are Guardian Caps? Shadow Hills football using new device to reduce head injuries