Apparently you can no longer wear alternate helmets in the NFL because of the concussion protocol. Someone was on ESPN talking about it this morning. Why has this rule not affected college football yet?
http://profootballtalk.nbcsports.co...ees-told-teams-not-to-wear-throwback-helmets/
http://profootballtalk.nbcsports.co...ees-told-teams-not-to-wear-throwback-helmets/