T1 - Hiking
Footpath is well marked. Terrain is even and flat, or slightly sloped. There is no risk of falling.
Requirements: None, you could also follow the itinerary in running shoes. Orientation is not a problem, usually even without a map.

T2 – Mountain hiking
Parts of the path can lack markings. Terrain sometimes steep. Falls are not to be excluded.
Requirements: Good footing. Hiking boots are recommended. Basic orientation know-how.

T3 – Demanding mountain hiking
Path is sometimes invisible. Hands might be needed for balance. Some stretches might be exposed to stone fall o cross moderately steep scree or rocky slopes where exposed stretches might be equipped with ropes or chains.
Requirements: very good footing. Good hiking boots. Average orientation capabilities. Basic experience in the mountains is advisable.

T4 – Alpine hiking and scrambling
At times there is no path. Hands might be needed for overcoming certain difficulties. Terrain is somewhat exposed with delicate grassy slopes or slopes mixing rocks, easy nevés or glacier which are not snow covered (no crevasse danger).
Requirements: Familiarity with exposure. Rigid soled hiking boots. Ability to evaluate terrain and good orientation capabilities. Alpine experience is advisable. In case of bad weather, retreat could be complicated.

T5 – Demanding alpine hiking and scrambling
There is often no path and some easy climbing. Terrain is exposed and demanding with steep slopes and rocks. Glaciers and nevés increase the risk of slipping and falling.
Requirements: Mountaineering boots. Confident evaluation of terrain and very good orientation capabilities. A good experience of the high mountains and basic use of ice axe an rope are required.