Abstract: A sock (1) comprises a heel part (H) between a tubular leg part (L) and a tubular sole part (S), which comprises mesh-number varying regions (V1-V6) arranged along a knitting axis (K), and tubular regions (C1-C5) arranged between the mesh-number varying regions. The mesh-number varying regions include an upper region (V1), a lower region (V6), and intermediate regions (V2-V5). The number of courses of the upper region (CV1) is smaller than the number of courses of the lower region (CV6) and the number of courses of the intermediate regions (CV2-CV5). The mesh-number varying regions are constituted by mesh-number increasing regions (V1, V3, V5) and mesh-number reducing regions (V2, V4, V6) alternatingly arranged along the knitting axis. The number of courses of the tubular regions (CC1-CC5) is smaller than the number of courses of the mesh-number varying regions (CV1-CV6).