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

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

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

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

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

The phantom line showing a portion of a shoe in FIGS. 1-15 is for illustrative purposes only and forms no part of the claimed design.