Funky-Looking Guardian Caps Rejected by NFL for Regulation Play
NFL mandates use of Guardian Caps for training camp in 2022
Puffy, spongy Guardian Caps could help curb NFL head injuries
NFL rejects PU safety caps for regulation play, allows 'opt-in
NFL Mandated Guardian Caps: Controversial Change - Sports
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Guardian Caps: What are they and why are NFL players wearing them
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Guardian Cap debuts during minicamps in effort to reduce avoidable
Guardian Caps: NFL requires use of helmet cover at training camps
NFL says positions wearing Guardian Caps saw 52% decrease in
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NFL Health and Safety Fact Sheet