I claim the ornamental design for footwear, as shown and described.
FIG. 1 is a right, front perspective view of footwear, showing my new design;
FIG. 2 is a right side view thereof;
FIG. 3 is a left, front perspective view thereof;
FIG. 4 is a left side view thereof; and,
FIG. 5 is a top view thereof.
The broken lines are included for illustrating environmental structure and form no part of the claimed design. Further, the dash-dot-dash lines immediately adiacent to the solid portions of the design define the bounds of the claimed design and form no part therof.