For the runner who loves the responsive feel of Nike Shox technology but wants a lighter, faster and more nimble ride, we created the Nike Shox NZ SI. Original Nike Shox four-column cushioning unit in the heel provides energy return and total comfort. Phylon forefoot delivers optimal cushioning and a responsive ride One-piece construction and a fitted upper frame linked with a gilly lacing system wraps the foot to the midsole. Full-length BRS 1000 carbon rubber outsole with modified circular waffle outsole offers better traction.