From the bottom of the snow arete from the snow tunnel head down the steep face facing down toward the Vallee Blanche (a good place to make some warm up turns). From the bottom of this face head around under the cliffs to the right until you can see the Cosmiques refuge. Side step or hike up to the col between this refuge and the Simond Refuge (smaller building on the right). This is also the same same starting point for the Cosmiques Couloir. The look for the ridge on the right.
Big open 45 angle field. 400 vertical m of skiing on glacier rond. Don't ski to far and miss the exit. The exit is colouir walker to the left and offers another 400 great skiing.
Look out For crevasses and avalanches. This is seroius skiing so be sure to know what youre doing.