FIG. 1 is a perspective view of a side element of a shoe upper showing my new design;

FIG. 2 is a side view of the side element of a shoe upper shown in FIG. 1;

FIG. 3 is a front view of the side element of a shoe upper shown in FIG. 1;

FIG. 4 is a rear view of the side element of a shoe upper shown in FIG. 1; and,

FIG. 5 is a top plan view of the side element of a shoe upper shown in FIG. 1.

The phantom lines showing portions of a shoe in FIGS.1-5 are for illustrative purposes only and form no part of the claimed design.