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What are Guardian Caps? NFL's latest padded helmets for added safety
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Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
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What are Guardian caps? See the NFL's latest head protection device - Deseret News
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Padded helmet cover shows little protection for football players - Scope
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Chicago Bears: Why players are wearing padded helmets
New helmet material is "better than foam" at absorbing impacts
More padding the issue of concussions and better helmets
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Football helmets with outside padding get tryout at high schools | ktvb.com
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