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New helmet material is "better than foam" at absorbing impacts
Chicago Bears: Why players are wearing padded helmets
Football helmets with outside padding get tryout at high schools | ktvb.com
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
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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 | Guardian Sports
What are Guardian caps? See the NFL's latest head protection device - Deseret News
Why are NFL players wearing padding on helmets at training camp?
U.S. Army Tactical Combat Helmets - Windpact
Padded helmet cover shows little protection for football players - Scope
More padding the issue of concussions and better helmets
