FIG. 1 is a bottom plan view of a heel element of a shoe sole showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a bottom perspective view thereof.

The broken line showing of a shoe throughout the figures is for illustrative purposes only and forms no part of the claimed design.

The broken line showing of a shoe upper and portions of a sole in FIGS. 1-5 is environmental only and forms no part of the claimed design.