I claim 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 back perspective view thereof; and,
FIG. 3 is a left side view thereof.
The dash-dot-dash broken line immediately adjacent to the shaded area represents an unclaimed boundary of the claimed design. The remainder of the broken lines are provided for environmental purposes only and form no part of the claimed design.