I claim the ornamental design for footwear, as shown and described.
FIG. 1 is a perspective view of footwear, showing my new design;
FIG. 2 is a left side view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The dash-dot-dash lines are included for illustrating environmental structure and form no part of the claimed design. The dashed lines represent stitching, which forms no part of the claimed design.