Road running, long runs, maximum cushioning. Features: Max cushioning meets Helion™ HF for max energy return; Forward-rolling, agile and fast; Dual foam construction to maximize cushioning levels; High-grip laces woven with silicone keeps you locked in; Helion™ HF absorbs impact and gives maximum rebound; A microfiber upper delivers breathability; Developed with professional athletes. Materials: Recycled Polyester. What do you get if you combine extreme CloudTec® with Helion™ HF hyper foam? Maximum cushioning with a kick. A dual foam midsole maximizes cushioning, while Helion™ HF in the forefoot absorbs impact for a rebound that will energize every stride. It's the same foam we use in our top racing models like Cloudboom Echo 3.. We deliberately removed the Speedboard® to encourage faster post-training recovery and to lessen the weight. The Helion™ HF hyper foam acts as a bounce board below your foot and propels you forward. For max energy return, max cushioning levels and hyper performance.