The ornamental design for footwear sole, as shown and described.
FIG. 1 is a perspective view of the footwear sole embodying the new design;
FIG. 2 is a bottom view thereof;
FIG. 3 is a reduced scale right side view thereof;
FIG. 4 is a reduced scale left side view thereof;
FIG. 5 is a front view thereof;
FIG. 6 is a rear view thereof; and,
FIG. 7 is a close-up view of the portion of the footwear sole identified in FIG. 1, including additional detail that are representative of the entire sole, but would have been unclear if shown in FIG. 1.
FIGS. 1–7 show features of an article of footwear in phantom lines. These features are shown for environmental purposes and do not form any part of the claimed design. Further, the phantom lines immediately adjacent the solid-line portions of the design form the boundary of the design, with the phantom lines forming no part of the claimed design.