The ornamental design for footwear, as shown and described.
FIG. 1 is a front perspective view of a show showing any footwear design;
FIG. 2 is a right side view of the footwear shown in FIG. 1;
FIG. 3 is a left side view of the footwear shown in FIG. 1;
FIG. 4 is a front view of the footwear shown in FIG. 1;
FIG. 5 is a rear view of the footwear shown in FIG. 1; and,
FIG. 6 is a top view of the footwear shown in FIG. 1.
The broken line showing of the zipper, footbed, portion of the heel cup, center seam, portion of the footwear upper and sole in the relevant drawings shows unclaimed subject matter for the design in those drawings.