* The NFL used to have a rule that made it hard for teams to wear old-fashioned uniforms. But now, they can wear a second helmet, which means teams can bring back cool old looks!
* Some of the best old uniforms have bright colors and simple pictures, like the Denver Broncos' "Orange Crush" ones. These old styles are really popular with fans and sell well.
* Teams are bringing back these classic uniforms because fans love them and they remind people of the old days of football. It's like a fun trip back in time for the game!