FIG. 1 is a perspective view of an insole, embodying my claimed design;
FIG. 2 is a bottom view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a rear view thereof; and,
FIG. 7 is a front view thereof.
The ornamental design which is claimed is shown in solid lines in the drawings. The dash-dot boundary line defines the boundary of the claimed design and forms no part of the claimed design. The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.