Seeking to reduce head contact, NFL mandates use of Guardian Cap helmet for early portion of training camp - ESPN
What are Guardian Caps? NFL's latest padded helmets for added safety
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NFL hopes to reduce head injuries with helmet experiment
NFL says positions wearing Guardian Caps saw 52% decrease in concussions - NBC Sports
Here's why some Patriots players are wearing caps over their helmets during training camp
NFL exec suggests Guardian Caps worn to protect players during practices could one day debut in games
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