New Smart Helmet Could Spot Concussions in Real Time
Revolutionary new ZERO1 football helmet may help NFL players reduce concussions
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Football Helmet Technology Lemelson Center for the Study of Invention and Innovation
NFL downgrades safety of 9 helmet models used by 18 percent of players - The Athletic
Guardian Caps Guardian Sports
Virginia Tech research provides much-needed data, system for rating sports equipment - ESPN
NFL To Introduce New Football Helmets - Big Blue View
EXPLAINER: NFL using helmet caps for player safety, research - The San Diego Union-Tribune
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What are Guardian Caps? NFL players sport specialty helmets for 2022 minicamp
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Football Helmets for 2017 - Riddell and Schutt Helmet Technology