The ornamental design for a solestructure, as shown and described.
FIG. 1 is a rear and lateral side view in perspective of a sole structure showing my new design;
FIG. 2 is a lateral side view thereof;
FIG. 3 is a medial side view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a front view thereof; and,
FIG. 7 is a rear view thereof.
The sole structure illustrated is a first embodiment showing a right-footed form of the sole structure. A second embodiment is for the left-footed form of the sole structure, which is a mirror image of the right-footed form, is not illustrated. The crosshatched/shaded areas of the figures represent a contrast in appearance and do not represent any particular color, material, texture, or finish. For example, the crosshatched/shaded areas may represent mesh fabric. The broken line illustration in the drawings is not part of the claimed design.