So what exactly is that black padding on the Syracuse football helmets seen during practice? - syracuse.com
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Why are NFL players wearing padding on helmets at training camp?
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Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
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What are Guardian Caps? NFL players sport specialty helmets for 2022 minicamp | Sporting News
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
NFL hopes to reduce head injuries with helmet experiment | The Seattle Times
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Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
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Guardian Caps: Why some NFL players are wearing them in training camps