FIG. 1 is a perspective view of a portion of a footwear sole showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a left side view thereof.

The broken lines shown in the FIGURES are for disclosure purposes only and do not form part of the claimed design.

The broken line defining the boundary of the design, and the broken lines showing the shoe-sole environment in which the design resides, form no part of the claimed design.