The ornamental design for footwear upper, as shown and described.
FIG. 1 is a perspective view of the footwear upper embodying the new design;
FIG. 2 is a top view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a front view thereof; and,
FIG. 6 is a rear view thereof.
FIGS. 1–6 show features of an article of footwear in phantom lines. These features are shown for environmental purposes and do not form any part of the claimed design. Further, the phantom lines immediately adjacent the solid-line portions of the design form the boundary of the design, with the phantom lines forming no part of the claimed design. The three arrangements of regularly spaced and regularly sized ovals on each side of the upper are shown in phantom lines and do not form part of the claimed design.