NFL, NFLPA to ban use of 10 helmet models
Impact test comparisons of 20th and 21st century American football helmets in: Journal of Neurosurgery Volume 116 Issue 1 (2012) Journals
The NFL and NFLPA ban 10 helmet models over safety concerns
NFL Concepts - 4/32 - Cardinals - Page 3 - Concepts - Chris Creamer's Sports Logos Community - CCSLC - SportsLogos.Net Forums
NFL, NFLPA Release 2021 Helmet Laboratory Testing Performance Results
NFL Schutt DNA Team Helmets 2022 by Chenglor55 on DeviantArt
NFL bans six low-performing helmets as league attempts to battle ongoing concussion problem - The Washington Post
If every NFL team had a black or gray Alt - Concepts - Chris Creamer's Sports Logos Community - CCSLC - SportsLogos.Net Forums
NYSportsJournalism.com - NFL, NFLPA Reveal 2022 Helmet Test Results
The NFL and NFLPA ban 10 helmet models over safety concerns
NFL, NFLPA release results of annual helmet testing: Three previously approved models now prohibited
Helmet Laboratory Testing Performance Results
AAF and XFL Uniform Concepts - Page 2 - Concepts - Chris Creamer's Sports Logos Community - CCSLC - SportsLogos.Net Forums