The ornamental design for footwear, as shown and described.
FIG. 1 is a front perspective view of footwear showing my new 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 heel, sole, portions of the footbed, and portions of the upper in the drawings depicts subject matter that forms no part of the claimed design.