So what exactly is that black padding on the Syracuse football helmets seen during practice? - syracuse.com
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Chicago Bears: Why players are wearing padded helmets
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NFL looking to introduce new football helmets - Dawgs By Nature
Find out how modern football helmets attempt to limit brain injuries | Britannica
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Football helmets with outside padding get tryout at high schools | krem.com
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/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/20121001030029helmets-web.jpg "Leatherhead to Radio-head: The Evolution of the Football Helmet | Arts & Culture| Smithsonian Magazine")
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Why Alabama football players are wearing padded helmets in practice - al.com
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More padding the issue of concussions and better helmets
