The ornamental design for footwear, as shown and described.
FIG. 1 is a front perspective view of a shoe showing my footwear;
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 sole, heel, zipper, footbed, heel cap, portions of the heel cup, portions of the strings, and portions of the zipper in the relevant drawings shows unclaimed subject matter for the design in those drawings.