The summits rising to the south consist of flysch. This is the more northerly of the two flysch zones in the Allgäu Alps. The mountains have a more gentle, rounded shape. As a result, they are a popular area in winter for ski and snowshoe tours. The best known mountain of this flysch zone is the Riedberger Horn, which is easy to climb from the Riedberg Pass. The so-called horns (Hörner) - the Ofterschwanger Horn, Sigiswanger Horn, Rangiswanger Horn and Bolsterlanger Horn - also belong to the flysch zone.