Headband

FIG. 1 is a front, top perspective view of a headband, showing my new design; FIG. 2 is a rear, bottom perspective view thereof; FIG. 3 is a front elevational view thereof; FIG. 4 is a rear elevational view thereof; FIG. 5 is a left-side elevational view thereof; FIG. 6 is a right-side elevational view thereof; FIG. 7 is a top plan view thereof; FIG. 8 is a bottom plan view thereof; FIG. 9 is a front, top perspective view of the headband of FIG. 1 in a partially folded configuration; and, FIG. 10 is an enlarged view of the area labeled 10 in FIG. 2 . The dashed broken lines in the figures illustrate portions of the headband that form no part of the claimed design. The dot-dash broken lines in the figures are used to identify areas of enlargement and form no part of the claimed design.