Just above the village of Rey, take the footpath which climbs up through a dense conifer wood, passing the old summer pastures of Prumayes, and into meadows.
After a short stretch of unmetalled road, you reach the summer pastures of Champillon (nearby you can admire the small church of Notre-Dame-des-Neiges).
Continue on up the unmetalled road until you reach, after a short while, the summer pastures of Pessinoille.
From here, the path passes on up through steep green meadows to the summer pastures of Tsa de Champillon and, a little further up, to Létey-Champillon mountain hut.
Note - this information is not directly connected to the Cammino Balteo path but it is part of the Aosta Valley tourist offer.