First QB helmet designed to help reduce concussions approved
NFL, union encouraged by helmet safety improvements
New helmet could offer Dolphins' Tua Tagovailoa concussion protection
FOOTBALL: NFL following Sequim's lead with protective caps
NFL, players' union approve QB-specific helmet designed to reduce concussions
QB helmet designed to reduce concussions approved by NFL - The Iola Register
Seeking to reduce head contact, NFL mandates use of Guardian Cap helmet for early portion of training camp - ESPN
NFL, Players Union Agree to Change Concussion Protocol - The New York Times
NFL, NFLPA approve helmet designed to reduce QB concussions - ESPN
NFL at 100: Helmets go high tech in quest for player safety - The San Diego Union-Tribune