New Era NFL 59Fifty Sideline Cap - Men's The New Era 59Fifty Sideline Cap is the on-field cap you'll be seeing your favorite athletes in on Sunday's in the fall. Now, you can rock a cap that features the logo's of two global giants with the New Era Flag on the left and the NFL logo shield on the back. This official sideline cap uses primary team color with black under the visor for a sweet style. The front has a raised embroidered team logo. 100% polyester. Imported.