Derrarinne is a colouir graded 4 as free ride (Skitouren und Skibergsteigen Allgäu). It is not technical nor exposed, the skiing substantially easier than for example Elferrinne. Derrarinne is however avalanche prone, best done in the morning hours and under safe snow conditions. You reach Derrarinne from Baad via Derratal. It starts in the saddle below Unspitze.