NFL Green Bay Packers Tech Knit Hat by New Era. Save 8 Off!. $24.95. 82% Nylon, 18% Spandex, 100% Acrylic Knit Lining. 82% Nylon, 18% Spandex. This New Era NFL On Field Collection Tech Knit features an embroidered Green Bay Packers team logo at front, a stitched New Era flag at wearer's left side and the NFL Shield embroidered on the back.