NFL approves alternate helmets beginning in 2022
The NFL Breaks the One-Helmet Rule – Green Gridiron, Inc.
NFL will allow teams to use alternate-color helmets again, starting in 2022 - NBC Sports
The NFL Breaks the One-Helmet Rule – Green Gridiron, Inc.
Houston Texans unveil alternate red helmet for first time
Chicago Bears unveil orange helmet for two games this season
Denver Broncos: Team won't wear throwback helmet in 2022
NFL Teams Debuting Alternate Helmets, Jerseys for the 2022 Season – NBC Los Angeles
Tracking all the new NFL uniforms and helmets for the 2022 season - ESPN
NFL changes helmet rules, opening door for Patriots to wear throwback red jerseys, Pat Patriot helmets in 2022 (report)
With the one-shell rule gone, here are all the alternate and throwback helmets NFL teams have unveiled so far - Footballscoop