The ornamental design for a cap, substantially as shown and described.
FIG. 1 is a perspective view of a cap showing my design;
FIG. 2 is a perspective view at a different angle of the cap;
FIG. 3 is a front view of the cap; and,
FIG. 4 is a rear view of the cap.
The two rows of broken lines that follow the edge of the visor, the single horizontal broken line at the front base of the crown, and the broken line occurring on the edge of the size adjustment opening and on both the top and bottom edges of the back strap, illustrate stitching and are part of the claimed design.
The vertical broken lines extending from the button to the edge of the crown, the ventilation holes, the tag, tag indicia, and tag attachment loop shown in broken lines illustrate environmental matter and form no part of the claimed design.