A super trainer for long runs and tempo runs. Featuring a CloudTec(R) cushioning system engineered for a responsive ride and Helion(TM) HF hyper foam for max energy return. Plus, a bottom layer of Helion(TM) foam offers extra durability. Design: The engineered knit upper features targeted zones for breathability Enhanced tongue design delivers step-in comfort and a secure lockdown In-Shoe Comfort: The CloudTec(R) cushioning system has been engineered for a highly responsive ride Made with a top layer of Helion(TM) HF hyper foam for max energy return and impact absorption, plus a bottom later for Helion(TM) foam for durability Additional Details: Heel-to-toe drop: 6mm