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Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries
SEC football head coaches detail using Guardian Caps for player safety
5 helmet products and the claims they make
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
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NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets - CBSSports.com
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