The Nike Challenger OG SE ‘Iron Grey Black’ presents a subdued colorway of the vintage runner originally released in 1979, making the shoe a contemporary of more well-known models like the Tailwind and Daybreak. A neutral grey finish is executed throughout the suede and leather upper, contrasted by a crisp white foam midsole. Underfoot, Nike’s classic waffle outsole is rendered in black rubber, complete with the patent number (‘US Patent No. 3,793,750’) stamped in the middle.