NFL, NFLPA approve first position-specific helmet for linemen
Football helmet - Wikipedia
NFL approves QB-Specific helmet to help quarterbacks keep their heads in game - Hindustan Times
For down stances: Is this the end of the line? - Sports Illustrated
NYSportsJournalism.com - NFL Testing Approves First QB-Specific Helmet - Concussion Discussion: NFL-NFLPA Tests Approve First QB-Specific Helmet
NYSportsJournalism.com - NFL Testing Approves First QB-Specific Helmet
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Vicis Zero2 Youth Football Helmet
Behold: The First Position-Specific Football Helmet