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