Well-known as spring skitour Clariden also offers perfect skyrunning terrain over a harmless glacier and some easy climbing stuff to the summit. It does not mean necessarily the glacier has no crevasses, but in most of the cases you can follow a huge track or you will run over bare ice. For the Iswändli, a 35 degree steep slope (ice or snow, depending on the season) trailrunning crampons are useful. The west ridge offers some climbing in via-ferrata-style.