FATMAP difficulty grade
From below the end of the Mer de Glace, look out for the ski tracks leading to the 10-20 min bootpack that leads up to the buvette des Mottets, where you can enjoy a drink after carrying your skis for a while.
Enjoy the 4x4 track 'James Bond' style all the way back down to Chamonix.
It is not always in good condition early or later in the season - be sure it is OK before planning on going down this way or you are in for an incredibly long walk! When snowy and in good condition, the line features countless fun hairpins and fast straights through the forest.