Vermuntbahn parking lot. Take it to the top station and from there by bus to Bielerhöhe.
From the Bielerhöhe you descend briefly to the lake and then pull up your skins. In winter, the lake is usually frozen over and even partly groomed, so that it can be crossed in a straight line. At the end of the lake (Klostertal) you keep to the valley on the right and ascend through gently rising terrain to below the Klostertaler Umwelthütte.
The following ascent is the key part of the tour and should only be done under safe conditions. The eastern slope is relatively steep and situated in a gully (steepest point almost 35°).
Once you have reached the high plateau, keep to the half-left and cross it in gentle steps until you reach a passage leading to the Glötter Glacier. The route selection is very obvious.
Continue to climb up the glacier until you reach a steeper terrain at the summit. This is at 30-32° but still very pleasant to walk on. First you ascend in zigzag and traverse at a small plateau to the summit ridge. From there it's not difficult to the summit.
Usually a ski depot is not necessary.
Descent first along the ascent route.
At about 2700m you can then turn right through a gap and keep as much height as possible.
Now aim towards the small ridge south of the ascent channel to avoid it. Here a short ascent (10-20m) may be necessary. Then ride down the wide steep slope (>30-40° depending on your line choice).