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

FIG. 2 is a front view of the article of footwear of FIG. 1;

FIG. 3 is a rear view of the article of footwear of FIG. 1;

FIG. 4 is a right side view of the article of footwear of FIG. 1;

FIG. 5 is a left side view of the article of footwear of FIG. 1;

FIG. 6 is a top plan view of the article of footwear of FIG. 1; and,

FIG. 7 is a bottom plan view of the article of footwear of FIG. 1.

The broken lines shown in the drawings represent portions of an article of footwear that form no part of the claimed design.