Long runs, tempo runs, fast ride. Features: CloudTec® cushioning system engineered for fast runs; Helion™ HF hyper foam for max energy return and propulsion; Propulsive glass fiber nylon-blend Speedboard®; Engineered mesh upper that's breathable and ultralight; Design inspired by our pinnacle, race-winning super shoes; Enhanced rocker shape for a fast propulsive ride; Updated toe box design for fast training sessions; Forefoot grip for added support during the toe-off phase. Materials: Recycled Nylon. A super trainer for performance-focused workouts, perfect for long runs and tempo runs.. Take control of your run with a CloudTec® cushioning system engineered for a fast ride. The midsole features Helion™ HF hyper foam for max energy return, while the nylon-blend Speedboard® infused with glass fibers propels you forward.