Skin up the Périades Glacier, continuing straight up (south-east) instead of towards the Col du Tacul. Once below the ridge line at an elevation of around 3400 meters, climb up the widest south-west facing couloir that comes down from the ridgeline. This couloir is 300 meters long and steepens to 50 degrees at the top. At the top of the approach couloir you reach a small col. To the left along the ridgeline is the outrageously positioned Périades bivi hut.

From the small col, abseil for 30-40 meters until onto the Mont Mallet Glacier. Continue down the skier's left side of the glacier, taking care to watch out for some big crevasses. The slope steepens slightly before joining the Leshcaux Glacier. Continue down to the Mer de Glace and the final section of the Vallée Blanche.