The ornamental design for footwear, as shown and described.
FIG. 1 is a left, top, front perspective view of footwear according to our new design;
FIG. 2 is a left side elevational view thereof;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof; and,
FIG. 6 is a top plan view thereof.
The broken lines illustrate unclaimed environmental structure. The broken lines immediately adjacent the solid-line portions of the footwear define the bounds of the claimed design form no part thereof.