FIG. 1 is a perspective view of a footwear sole embodying our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof.

FIGS. 1-6 show features of the footwear in phantom lines. These features are shown for environmental purposes, and do not form any part of the claimed design. Furthermore, the phantom lines around the perimeter, and immediately adjacent to the solid-line portion of the design, form the boundary of the design, with the phantom lines forming no part of the claimed design.