The ornamental design for a hairband, as shown and described.
FIG. 1 is a perspective view of a hair band from top-right;
FIG. 2. is a perspective view thereof from bottom-right;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5. is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a right-hand side view thereof;
FIG. 8 is a sectional view taken along the line 8—8 of FIG. 3;
FIG. 9 is a perspective view showing how the hair band is used; and,
FIG. 10 is a front view showing how the hair band is used.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.