A sole for a running shoe with an elastic midsole (1) is disclosed, wherein the midsole (1) has several channels (41, 42, 43) extending in the transverse direction (Q) of the midsole (1) and arranged one behind the other in the longitudinal direction (L) of the midsole (1), wherein the channels (41, 41', 42, 43) or at least a part of the channels each have a lateral and / or medial opening in the midsole;and - in cross-section along a cross-
sectional plane in the longitudinal direction (L) of the midsole (1) and perpendicular to the transverse direction (Q) of the midsole (1) have an anterior boundary and a posterior boundary, as well as a main longitudinal axis (411, 411', 421), along which the channels (41, 41, 42, 43) extend in a slit-like manner from their respective posterior boundary to their respective anterior boundary such that the lateral and / or medial opening of the channels narrows along the main longitudinal axis (411, 411') from the posterior boundary (414, 414') to the anterior boundary (413, 413').