The Nike Shox R4 “Metallic Silver” is the 2019 retro release of the classic Shox running shoe. Originally debuting in the early 2000s, Shox technology was one of the biggest trends in athletic footwear in the first decade of the new millennium. Now Nike Sportswear has brought back one of the most popular Shox models ever, the R4 running shoe. The Shox R4 retro is featured in this original colorway with a combination of perforated white leather and molded synthetic paneling in metallic silver with the Shox cushioning in red. The Nike Shox R4 “Metallic Silver” retro released in March 2019.