After arriving at the top of the Index lift (the highest lift at Flégère), turn right and descend NW passing beneath the Crochues ridges. Continue on to the Lac Blanc chalet and then up to the Col.

The descent starts with a narrow 80m couloir at an angle of 40°. If the snow is unskiable a rope must be used to descend safely. The descent veers left down into the Bérard valley and continues on to the small mountain village of Le Buet at 1443m. From here, hitch back to Chamonix or take the train through the tunnel under the Col de Montets.