On Running Cloudultra 2 is a well cushioned versatile, all-terrain trail shoe suitable for tackling various distances and various paces across all terrains from road to trail. With On's signature Helion superfoam, this update offers a more comfortable and smooth ride on rugged terrain. The TPU Speedboard adds energy with each step, while the CloudTec cushioning system protects against impact. On used a knitted sock upper made from 100% recycled polyester for an effortless step-in experience.