FATMAP difficulty grade
Start by taking Masse 1, then the Lac Noir chair.
The route begins by walking up to the right of the top of the chairlift. After a short ski, you see La Gratte straight ahead.
Instead of walking up towards its summit, ski down to the Col de la Bache (2529m), in the direction of Le Teurre.
From the Col de la Bache, traverse round to the left of Lac Crintallia (2420m).
(Note: if the avalanche risk is significant, be careful of the fairly steep slopes above you, to your left, as you traverse.
Go lower if necessary). Continue to the left of Le Teurre (identifiable by the antenna on the top).
Now comes the main ski, in the Combe des Yvoses, with plenty of options either side of the Rau des Yvoses (the stream).
The slope is moderately steep, and the skiing can be quite physical, especially when chopped up with ski tracks.
(The main avalanche danger is the steep slope down from le Teurre, to your right.) There are a few chalets dotted across the slope.
Le Bettaix comes into view.
Either cross the stream to the left above the chalet pictured (above right), and find the gap through the trees to arrive in le Bettaix; or stay right, and join the cross-country track for a few metres, to arrive in Le Bettaix that way. Cross the bridge over the Doron de Belleville.
Return to Val Thorens via the Bettex chair (slow), the Tortollet chair (otherwise known as the Tortoise), Menuires chair, and Mont de la Chambre chair.