FATMAP difficulty grade
A wonderful, wild hike away from the crowds to a very old, very small refuge.
The views are amazing and the whole experience is unforgettable.
There is no mountaineering on the route but getting down from the Montenvers train and up from the glacier are long metal ladders so a head for heights is needed.
Note that the access from the Mer de Glace has changed - more information can be found here: https://www.chamoniarde.com/images/files/Acc%C3%A8s-Charpoua-2016.pdf.