Guardian Caps Debut During NFL Minicamps
What are Guardian Caps? NFL's latest padded helmets for added safety
Guardian Cap Debuts at Training Camps League-wide
Guardian Caps, a soft-shell helmet cover, among CFL's new player-safety initiatives
Eagles Notes: New Guardian Caps get mixed reviews – Delco Times
NFL players wear Guardian Caps to reduce head trauma during training camp
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
EXPLAINER: NFL using helmet caps for player safety, research - The San Diego Union-Tribune
NFL hopes to reduce head injuries with helmet experiment
First QB helmet designed to help reduce concussions approved by NFL, NFLPA
NFL hopes to reduce head injuries with helmet experiment
Cowboys Players Wearing Strange New Helmets at Training Camp – NBC 5 Dallas-Fort Worth
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
Giants react to NFL's new 'Guardian Caps' at training camps - Big Blue View