First QB helmet designed to help reduce concussions OK'd - TheGrio
Light helmet design's effectiveness pits company versus NFL, NFLPA and their testing - The Athletic
Who has the biggest helmet in the NFL? - Quora
First QB helmet designed to help reduce concussions approved
NFL, NFLPA approve first position-specific helmet for linemen
NFL, players' union approve QB-specific helmet designed to reduce concussions – NBC Sports Bay Area & California
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Revolutionary new ZERO1 football helmet may help NFL players reduce concussions
Panthers linemen hope new helmet padding helps reduce concussion risk
Steelers QB Kenny Pickett turning to new helmet technology to help avoid further concussions in 2023