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 right side view thereof; and,
FIG. 3 is a back perspective view thereof.
The dot-dot-dash broken lines immediately adjacent the shaded areas represent the bounds of the claimed design, while all other broken lines are included for the purpose of illustrating portions of the footwear; the broken lines form no part of the claimed design.