Follow the ski du fond track north west, until you come to a path through the trees heading west, follow this, it briefly comes back on to the ski du fond track. After this follow the torrent Du Creuzet south, stay on the valley floor until it steepens in a tight gorge. Climb the gorge (you can use the slopes to the left as well) and then continue in the river bed for a few hundred metres and then climb the steep bank to the right. From there keep going west out of the trees and you should see the big east facing slope that narrow at the top. Climb this to the ridge.
Ski back the way you came in.