A sole member for an article of footwear, comprising: a sole member, the sole member including an outer surface, the outer surface comprising an upper surface (152, 1252) and a lower surface (154, 1254); the sole member having an interior portion, wherein the interior portion is disposed between the upper surface (152, 1252) and the lower surface (154, 1254); the sole member having a forefoot region and a heel region; the sole member having a set of apertures, wherein at least one aperture of the set of apertures is a blind-hole aperture; wherein each aperture of the set of apertures is disposed along a portion of the outer surface of the sole member; wherein each aperture of the set of apertures has a cross-sectional diameter; wherein at least a portion of the set of apertures is arranged along the outer surface of the sole member to comprise a first column of apertures; wherein the first column of apertures extends from the forefoot region to the heel region; wherein the first column of apertures includes at least a first aperture, a second aperture disposed adjacent to the first aperture, and a third aperture disposed adjacent to the second aperture, and wherein the first aperture has a first cross-sectional diameter, the second aperture has a second cross-sectional diameter, and the third aperture has a third cross-sectional diameter; and characterised in that the first cross-sectional diameter is smaller than the second cross-sectional diameter, and the second cross-sectional diameter is smaller than the third cross-sectional diameter; and in that the first column includes a midfoot region, wherein the cross-sectional diameter of a majority of the apertures of the first column generally increases in a direction from the forefoot region toward the midfoot region of the sole member; and in that the cross-sectional diameter of a majority of the apertures of the first column generally increases in a direction from the heel region toward the midfoot region of the sole member. a sole member, the sole member including an outer surface, the outer surface comprising an upper surface (152, 1252) and a lower surface (154, 1254); the sole member having an interior portion, wherein the interior portion is disposed between the upper surface (152, 1252) and the lower surface (154, 1254); the sole member having a forefoot region and a heel region; the sole member having a set of apertures, wherein at least one aperture of the set of apertures is a blind-hole aperture; wherein each aperture of the set of apertures is disposed along a portion of the outer surface of the sole member; wherein each aperture of the set of apertures has a cross-sectional diameter; wherein at least a portion of the set of apertures is arranged along the outer surface of the sole member to comprise a first column of apertures; wherein the first column of apertures extends from the forefoot region to the heel region; wherein the first column of apertures includes at least a first aperture, a second aperture disposed adjacent to the first aperture, and a third aperture disposed adjacent to the second aperture, and wherein the first aperture has a first cross-sectional diameter, the second aperture has a second cross-sectional diameter, and the third aperture has a third cross-sectional diameter; and characterised in that the first cross-sectional diameter is smaller than the second cross-sectional diameter, and the second cross-sectional diameter is smaller than the third cross-sectional diameter; and in that the first column includes a midfoot region, wherein the cross-sectional diameter of a majority of the apertures of the first column generally increases in a direction from the forefoot region toward the midfoot region of the sole member; and in that the cross-sectional diameter of a majority of the apertures of the first column generally increases in a direction from the heel region toward the midfoot region of the sole member.