NFL Mandated Guardian Caps: Controversial Change - Sports Illustrated Seattle Seahawks News, Analysis and More
Could Guardian Caps be used in games? - NBC Sports
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
Guardian Caps: Why some NFL players are wearing them in training camps
Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
Safer hits: Guardian Caps offer potential player protection, but obstacles to adoption remain - WVUA 23
NFL training camps: Guardian Cap players are wearing over helmets, why
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic