The Nike Challenger OG SE 'Iron Grey Black' showcases a subtle color scheme that stays true to the vintage runner's roots, dating back to its original launch in 1979. This places the shoe in the same era as iconic models such as the Tailwind and Daybreak. The upper is adorned with a sleek combination of suede and leather, featuring a neutral grey tone that exudes sophistication. To provide a striking contrast, a pristine white foam midsole is incorporated into the design. The optically engaging waffle outsole, a nod to Nike's timeless design, is crafted with black rubber and prominently displays the patent number ('US Patent No. 3,793,750') at the center.