Guardian Cap Debuts at Training Camps League-wide
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
NFL exec suggests Guardian Caps worn to protect players during practices could one day debut in games
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Ultimate Georgia Football x Guardian Caps
Guardian Caps: Why some NFL players are wearing them in training camps
Guardian Caps The Rundown // Guardian Sports
What Are Those Weird Helmets NFL Players Are Wearing?, by Joe Scaglione
Seeking to reduce head contact, NFL mandates use of Guardian Cap helmet for early portion of training camp - ESPN
NFL, players union script a play for safety with Guardian Caps – WHIO TV 7 and WHIO Radio
Guardian Championship Pro-Am begins
Guardian Caps The Rundown
Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
Guardian Caps: The new helmets worn by several NFL teams