FIG. 1 is a first perspective view of an article of footwear, showing my new design;

FIG. 2 is a second perspective view thereof; and,

FIG. 3 is a side view thereof.

The broken line showing is for illustrative purposes only and forms no part of the claimed design.

Any surface of the article of footwear not shown, including any part of any such surface, is not part of the claimed design.