On Cloudultra Pro

On's UTMB killer, this shoe was painstakingly designed to win the tough UTMB course - 176km and 10000m of vert through Chamonix. The Cloudlultra Pro has a dual-layer midsole of Helion HF, Speedboard rebound system, and a re-engineered Missiongrip™ outsole with a new lug profile developed using FEA (Finite Element Analysis).