NFL hopes to reduce head injuries with helmet experiment
Cowboys wearing soft-shell helmets in practice as part of NFL mandate
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At Last, Football Faces Concussion Problems Head-On : NPR
NFL mandates extra head protection for training camp
Safety measures: NFL hopes to reduce head injuries with helmet
Puffy, spongy Guardian Caps could help curb NFL head injuries
NFL's use of Guardian padded helmet caps in camp draws support and
What's with padded helmet caps teams are wearing
More padding the issue of concussions and better helmets