The legendary ski mountaineering race Patrouille des Glaciers is without a doubt one of the longest and toughest in the world. Organised by the Swiss army and held every two years (the next one will be held from 16 to 22 april 2018) in the Canton Vallese, the Patrouille des Glaciers is the skimo event that attracts the most competitors. 4950 athletes at the start, split into 1650 teams, cover 3990 metres of elevation gain in a single day between Zermatt and Verbier (route Z) or alternatively, approximately 2000 metres of elevation gain between Arolla and Verbier (route A).

Official website Patrouille des Glaciers