adidas' ZX line emerged in the 1980s with a mission to design shoes for runners of all stripes. The adidas ZX 630 builds on the concept of the 600, a rugged design from 1985. This model features a mesh and suede upper for a lightweight, supportive feel. A TPU heel clip helps promote stability, while EVA foam in the midsole adds comfort to every step. The shoe is completed with a grippy rubber outsole for traction.