History of the NFL Helmet
NFL nearing end to one-helmet rule? - The Falcoholic
Since the NFL killed its one-shell helmet rule, here's my idea for an alternate Dolphins helmet. Thoughts and feedback appreciated. Thanks. : r /miamidolphins
If The NFL's 'One Shell Rule' Were Revoked (NFC Edition)
With the one-shell rule gone, here are all the alternate and throwback helmets NFL teams have unveiled so far - Footballscoop
NFL scraps one-helmet rule, allowing throwback colors - The Athletic
Riddell launches Axiom, latest helmet to combat concussions
NFL Should Abolish the 'One-Shell Rule : r/nfl
NFL Quarterback rankings: A new No. 1 emerges going into Week 5 - Behind the Steel Curtain
With the NFL losing its one-shell rule, I came up with an idea for an alternate Ravens' helmet. Thoughts and feedback appreciated. : r/ravens