A sock includes an air escape route that allows humid air to be expelled
to the outside of a shoe. The sock may include a first rib area provided
in a ground-touching area of a sole portion of the sock, the ribs being
formed in a desired direction. A second rib area, in which ribs are
formed in a wale direction, may also be provided in an instep portion of
the sock. The ribs of the first and second rib areas may be knitted with
alternating knitted pile and knitted mesh fabric. Humid air collecting in
areas that do not touch the ground passes through the concave portions of
the ribs of the first rib area, and is impelled toward the instep side.
Air flowing to the instep side of the sock via the first rib area is
expelled to the outside of the shoe via the second rib area.