The story on the adidas ZX series is one of legends. The innovative franchise has been breaking boundaries since day one — seemingly immortal, continuously morphing. Not unlike another legend subtly fused into these shoes' inspiration and design. (Check the sockliner.) The foundation is the ZX 5K, one of the series' most progressive trainers. From there it evolves. The result? Reflective 3-Stripes, Boost cushioning and an interplay of technical and natural details.