Cleveland prepares for NFL Draft: See the helmets, festivities downtown
New Riddell SpeedFlex football helmet pits technology vs. concussions
N.F.L. Will Allow Six Social Justice Messages on Players' Helmets - The New York Times
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Seeking to reduce head contact, NFL mandates use of Guardian Cap helmet for early portion of training camp - ESPN
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NFL Helmet Challenge Raises the Bar for Helmet Technology and Performance, Awards $1.55 Million in Grant Funding to Help New Models Get on Field Faster