I claim the ornamental design for footwear, as shown and described.
FIG. 1 is a right perspective view of footwear, showing my new design;
FIG. 2 is a right side view thereof;
FIG. 3 is a left perspective view thereof; and,
FIG. 4 is a left side view thereof.
The dashed lines are illustrating environmental structure and form no part of the claimed design. Further, the dash dot dash lines immediately adjacent the solid-line portions of the design form the boundary of the design, and forms no part of the claimed design.