What is the NFL guardian cap and how does it work? – NBC Sports Washington
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Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries : r/nfl
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Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
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What are Guardian caps? See the NFL's latest head protection device - Deseret News
Oklahoma Sooners Continue to be Proactive in Player Safety With Guardian Caps - Sports Illustrated Oklahoma Sooners News, Analysis and More
CFL introduces mandatory extra helmet protection for multiple positions. As well as other new health & safety measures. : r/sports
Why are NFL players wearing padding on helmets at training camp?
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