Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
Why are NFL players wearing padding on helmets at training camp?
Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries
NFL training camps: Guardian Cap players are wearing over helmets, why
NFL training camps: Guardian Cap players are wearing over helmets, why
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
NFL's handling of concussions questioned after Tua's injury
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Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety
The story behind those soft-shell puffy Guardian Caps players have been wearing
What are Guardian Caps? NFL's latest padded helmets for added safety
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets