From the hairpin turn (1206m) traverse the Soi torrent slightly to the S of the Frassenaye hamlet, take a walkway which climbs in the forest and which joins the Soi road. Follow it for awhile.

There are two possibilities for reaching the foot of the corridor: -at the third hairpin turn, take a walkway which traverses the torrent to reach the Soi d'en Bas chalet (1679m). Go towards the SSE, the slopes become rather steep and intersect with bars to reach a small scoop framed by the ridges of Sélaire and Sex Bornay. Go around the bump 2289m on the right (S) and you end up on the plateau of the Soi glacier;

-after the fourth hairpin turn (possibility of cutting between the hairpins), take a walkway which leads around the Soi d'en Haut chalet (1864m). Cut across the high mountain pastures to join the Soi ridge. Follow it towards the SE (sometimes visible walkway) until the ridge gets towards 2050m then leave it forking towards the right (S). Traverse above a rock band and reach a plateau (Les Grus) then a new steep pitch that is crossed easily. You emerge in a large basin occupied by the Lac de Soi (2247m). The traverse to the SSW in the direction of the cone corridors of  Dent Jaune and des Doigts. This second route is very pretty and particularly advantageous when one can climb high enough in the car via the Soi road in spring.

Approach the cone which becomes steeper then divides into two branches: the corridor of  Dent Jaune to the left (E) and the corridor of des Doigts on the right (W).

Go up the corridor des Doigts, initially quite broad. You pass a throat halfway up and then reach steep, but broader slopes (S5). 200m before the top out, the corridor divides into two branches. The one on the right (while climbing) is steeper (S5) but 20m less in height while the one on the left, slightly easier, emerges at the foot of the des Doigts summit gendarmes.

Descent: by the same route giving preference to the option joining the Soi d'en Bas farm.

The route is described in François Labande's topo-guide, Ouest-Suisse, course n°16.

The vertical drop is given here in the most unfavourable case (in full season). However, it is possible to go higher to some extent on the Soi road at the beginning or end of the season. In the latter case, the road is often full of debris and stones making this ordinarily spectacular journey even more difficult.

The corridor is approximately 800m high including the cone. The slope is  unrelenting (S4 with significant S5 sections): on average 43°/700m with sections at more than 45° including the right top out, inclined at 48°. The corridor is rather broad except at the section of the central narrow part which can also be narrower due to snowslides, making it very difficult to cross. The lower part of the corridor is slightly exposed. The upper part is very exposed due to the above mentioned narrow part.

The corridor primarily faces N but the upper part is slightly turned and the top out branches are more exposed to the sun, in particular the one on the left which can be in very hard snow while the remainder of the corridor is in powder snow.

Access:
Head towards Monthey, Trois-Torrents then Val d'Illiez. Go left at the Val d'Illiez exit, towards Play. Go left again after crossing a torrent: you descend to the bottom of a dale and go up on the left after the bridge. Go 4 km on this road until a crossroads, la Meuraye (1160m). If the snow cover is low, park your car by going right at the crossroads until a dale (avalanche in general). If it is the end of the season or autumn, go left at the crossroads then at the end of 1 km, take the road on the right leading to the Soi high mountain pasture. Park at the third hairpin turn (1570 m), where you can see the Soi d'en Bas farm a little higher up on the other side of the torrent. Right at the beginning of season you can only get to Soi (1950m), then take the walkway which crosses towards the glacier.

Ice axe/crampons without forgetting a helmet. A rope may be useful particularly if the section of the central narrow part is difficult.