From the top of the Col chairlift slide 50m on the piste then down and right onto the Chaviere glacier. Follow the skin-track ‘motorway’ heading for the Col de Gébroulaz but branch off this early, before it makes a big right turn, and head for the back of the Aiguille des St Pères - you are heading for a small notch between two rocky horns. The last 50m is generally a boot-pack.

Depending on snow cover you may be able to ski straight from the col, otherwise a short down-climb or abseil may be necessary (there is a bolt in a block if you look closely). For most experienced steep skiers, a 30 metre abseil (using either 2 x 30 metre ropes or a single 60m rope) will suffice to get you to a sensible point from which to start skiing. The first 100m are steep - approaching 50º, then the couloir backs off to 45º for 200m or so, and gradually eases back as you join the other branches descending from your right.

On the big face at the bottom you can pull right to prolong the fun in the gully behind the moraine ridge before eventually rejoining the pistes. Now give yourself a pat on the back, award yourself extra bragging points and then remember that this couloir has been straight lined from the very top!