I claim the ornamental design for a head wrap, as shown and described.
FIG. 1 is a front elevation view of a head wrap, showing the claimed design as it appears when being worn.
FIG. 2 is a side elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a rear plan view showing the claimed design when flattened and not in use;
FIG. 6 is a front plan view thereof; and,
FIG. 7 is a perspective front/side view thereof.
The head and neck of a woman as well as the pattern on the surface of the forehead band illustrate environmental matter, and form no part of the claimed design.