On Cloudflow 5 Women's Ivory SeedlingThe training shoe for fast intervals. With Helion HF hyper foam and a nylon blend Speedboard for high energy return. Key features Weight: 231g A layer of Helion HF for max energy return and rebound Propulsive glass fiber nylon blend Speedboard Engineered woven mesh upper that's breathable and ultralight Design inspired by our pinnacle, race winning super shoes Extreme rocker shape for a fast, forward rolling ride Updated toebox design for fast