9, but may be fixed to the outer layer 8. The non-fixed portions 4n of one of the shoelaces 4 are interlocked with the non-fixed portions 4n of the other adjacent shoelace 4 or the non-fixed portions 60n of an adjacent linear body 60. Since the arrangement of the shoelaces 4 is similar to the arrangement of the adjacent linear bodies 60, redundant description will be omitted.

FIG. 6 illustrates, in an enlarged manner, an interlocked portion 60H in which the non-fixed portion 4n of the shoelace 4M and the non-fixed portion 60n of the linear body 63 adjacent thereto are interlocked with each other. As described above, the interlocked portion 60H that is a connection portion between the shoelace 4M and the medial portion 6M is disposed inside the base body 5, specifically, is disposed in the space between the outer layer 8 and the inner layer 9. The same applies to a connection portion between the shoelace 4L and the lateral portion 6L. In the present embodiment, the shoelaces 4 arranged outside the base body 5 and the enclosure 6 disposed inside the base body 5 are connected via the string passing portions 52, as already described above.

Among the plurality of linear bodies 60, the linear bodies 61 and 66 that are arranged on the lowermost side include respective portions that pass through the gaps 91 and come out from the space between the outer layer 8 and the inner layer 9. The lower portion 6B is formed with these portions. Thus, the lower portion 6B is formed with a part of the linear body 61 and a part of the linear body 66. In the present embodiment, the lower portion 6B includes interlocked portions 60H in which the relevant linear bodies 60 are interlocked with each other as illustrated in FIG. 9. According to such a configuration, since the interlocked portions 60H each serve as a joint to facilitate movement of two linear bodies 60 (i.e., the linear bodies 61 and 66), the enclosure 6 more flexibly follows changes in the shape of the sole of the foot according to the movement of the foot of the wearer to enhance the effect of improving the fit feeling.

In the present embodiment, the lower portion 6B has a plurality of (specifically, three) the interlocked portions 60H, but without being limited thereto, a structure having one interlocked portion 60H may be employed, for example. However, according to the configuration including the plurality of interlocked portions 60H, since a plurality of pairs of the linear bodies 60 extending from the left and right and interlocked with each other are provided, pressure can be applied to the sole of the foot of the wearer in a relatively wide area. The plurality of interlocked portions 60H illustrated in FIG. 9 are arranged in the foot length direction while aligning the positions in the foot width direction, but the present embodiment is not limited thereto.

FIG. 10 is a perspective view illustrating the lower portion 6B of the enclosure 6, and the insole 32. The insole 32 extends in the foot length direction from a toe-side region TF in which the toe of the foot of the wearer is supported, to a heel-side region HF in which the heel of the foot of the wearer is supported, through an arch region AF facing the arch of the foot of the wearer. The lower portion 6B is disposed in at least a part of the arch region AF. The enclosure 6 is configured to enclose at least a part of the arch of the wearer from below. Hence, it is possible to more effectively improve the fit feeling by applying pressure to the arch of the foot.

FIGS. 11A and 11B illustrate a modification regarding a disposed position of a lower portion 6B. In this modification, a sleeve 10 having a tubular shape and having openings 10a at opposite ends in the foot width direction of an insole 32, is formed, and the lower portion 6B is inserted into the sleeve 10. According to such a configuration, since the sleeve 10 is interposed between the sole of the foot of the wearer and the lower portion 6B, uncomfortableness and discomfort caused by the feel of linear bodies 60 that form the lower portion 6B can be effectively reduced. A lower edge of an inner layer 9 that forms gaps 91 (see FIGS. 5 and 6) may be connected to edges of the openings 10a.

In FIGS. 11A and 11B, since the sleeve 10 is formed on the insole 32, the relative position of the lower portion 6B with respect to the insole 32 is stabilized. A central portion of the insole 32 in the foot length direction is separated as a single piece having an upper side and a lower side across one end to the other end in the foot width direction. The sleeve 10 is formed with the separated portion. The sleeve 10 is depicted as bulging upward, but it may have a flat shape along an upper surface of the insole 32. From the viewpoint of applying sufficient pressure to a predetermined region in the sole of the foot of the wearer, an area ratio of the sleeve 10 to the insole 32 in top view may be 20% or less. Alternatively, the area ratio may be 20% or more from the viewpoint of expanding a movable area of the lower portion 6B so as to tailor a physical individual difference of the wearer.

The sleeve 10 illustrated in FIG. 11A has a shape in which the width of the sleeve in the foot length direction is substantially constant. Since the sleeve 10 having such a shape can be manufactured relatively easily, manufacturing cost can be cut down. The sleeve 10 illustrated in FIG. 11B has a shape in which the width of the sleeve in the foot length direction increases toward the center in the foot width direction. According to such a configuration, movement of the lower portion 6B in the foot length direction is restrained at opposite end portions in the foot width direction, while in a central portion in the foot width direction, the movement of the lower portion 6B in the foot length direction can be permitted. In the illustrated example, the sleeve 10 is formed in an inverted hourglass shape, but without being limited thereto, it may have an oval shape, for example.

For the linear bodies 60 forming the enclosure 6, for example, a yarn obtained by bundling a plurality of fibers, linearly-formed resin, a twisted yarn, or the like is used. As a material of the linear bodies 60, for example, a polyurethane-based thermoplastic elastomer, polyurethane, nylon, spandex, Kevlar (registered trademark), ultra-high molecular weight polyethylene, a single covered yarn (SCY) or a double covered yarn (DCY) that covers polyurethane, or the like is used. The linear bodies 60 are preferably formed of a resin material having a property of being easily recycled simultaneously with the upper 3. The linear bodies 60 of the medial portion 6M are formed of the same material as those of the linear bodies 60 of the lateral portion 6L, but the present embodiment is not limited thereto. The shoelaces