From the Tourist Office of the village of Saint Sorlin d'Arves, this route takes you to the Col de la Croix de Fer by a path that climbs most of the time laces. The first part is on a single path, which widens after the crossing of the road, to resume in single at the foot of the pass after crossing the wet area on the walkways. 5km climb to train at this type of profile! If you leave in the freshness of the morning or evening, you may see a few marmots!