NFL Mandated Guardian Caps: Controversial Change - Sports Illustrated Seattle Seahawks News, Analysis and More
CFL players adjust to protective helmet caps
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Guardian Cap Debuts at Training Camps League-wide
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Guardian Caps: What are they and why are NFL players wearing them? - Sactown Sports
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Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries
Guardian cap' to prevent head injuries mandated for practices, CFL says
Patriots, rest of NFL wearing cushioned helmet caps at training camp, per new mandate - CBS Boston
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact