NFL to Allow Throwback Helmets Starting in 2022
NFL scraps one-helmet rule, allowing throwback colors - The Athletic
Eagles to debut black helmets with all-black uniforms against Packers
13 NFL teams introduce alternate helmet looks for 2022 season
Eagles' kelly green throwback uniforms can return thanks to NFL alternate helmet rule change
A new rule could have kelly green uniforms back for 2022 [UPDATE] - Bleeding Green Nation
Eagles unveil black alternate helmets - NBC Sports
Check out more awesome unofficial alternate NFL helmets - ESPN
NFL Color Rush - Wikipedia
NFL to allow alternate-color helmets for 2022; will Packers consider them for new throwbacks? - Acme Packing Company
Totally cool two-tone helmets for every NFL team