The ornamental design for a hairband, as shown and described.
FIG. 1 is a perspective view of a hair band showing my new design, the
broken lines showing the human form being for illustrative purposes only
and forming no part of the claimed design;
FIG. 2 is a side elevational view thereof, the undisclosed opposite side of
FIG. 2 continues the configuration of the side shown;
FIG. 3 is a top plan view thereof, the bottom being identical thereof.