Sockliner and method of manufacturing the same

A sockliner including a forefoot portion configured to support a toe portion and a ball portion of a foot of a user, a midfoot portion configured to support an arch portion of the foot of the user, and a rearfoot portion configured to support a heel portion of the foot of the user, the sockliner being configured for placement on an inner bottom surface of footwear for use, the sockliner comprising:

• a base layer portion having a lower surface configured to face the inner bottom surface of the footwear;
• and
• an upper layer portion covering an upper surface of the base layer portion, wherein
• the base layer portion comprises a three-dimensional mesh structure body in which a unit structure is repeatedly arranged in multiple arrays, the unit structure having at least one of a three-dimensional lattice structure and a three-dimensional wall structure,
• the upper layer portion has a sheet structure body comprising a through-hole group including a first plurality of holes penetrating through the upper layer portion in a thickness direction of the upper layer portion,
• each of the first plurality of holes included in the through-hole group is inward from a peripheral edge of the upper layer portion without reaching the peripheral edge of the upper layer portion,
• the first plurality of holes is arranged in a substantially radial pattern at the forefoot portion with respect to a substantially central position of the forefoot portion, and in a substantially radial pattern at the rearfoot portion with respect to a substantially central position of the rearfoot portion,
• a surrounding region is defined as a region between the peripheral edge of the upper layer portion and a position offset by 4.0 mm inward from the peripheral edge of the upper layer portion,
• the through-hole group includes an outermost hole group including a second plurality of holes penetrating through the upper layer portion in the thickness direction of the upper layer portion and located closer to the peripheral edge of the upper layer portion than the first plurality of holes, to overlap with the surrounding region and to align along the peripheral edge of the upper layer portion without reaching the peripheral edge of the upper layer portion, and
• when viewed in the thickness direction of the upper layer portion, among the first and the second plurality of holes included in the through-hole group,
• the first and the second plurality of holes in a region on a front end area of the forefoot portion are arranged substantially radially in dotted lines,
• the first and the second plurality of holes in a region on a rear end area of the rearfoot portion are arranged substantially radially in dotted lines,
• the first and the second plurality of holes in a region on a rear end area of the forefoot portion are arranged substantially in a matrix in dotted lines,
• the first and the second plurality of holes in the midfoot portion are arranged substantially in a matrix in dotted lines,
• the first and the second plurality of holes in a region on a front end area of the rearfoot portion are arranged substantially in a matrix in dotted lines, and
• the upper surface of the base layer portion is provided with protrusions and recesses due to the presence of a third plurality of holes on an inside of and in an outer surface of the base layer portion.