A revolutionary product dedicated to La Sportiva's Ultra Trail world. New XFLow™ foam, designed and developed to guarantee maximum cushioning and energy return kilometre after kilometre. Every detail has been designed to meet the needs of the most demanding ultra runner: the wide toe box and breathable upper provide comfort even after several hours of running, the Wrapping System construction and perfect heel ergonomics ensure stability and protection while the geometry of the rocker emphasises a fluid and progressive stride on any terrain.