Curved headband

FIG. 1 is a perspective view, showing the new design for a curved headband;

FIG. 2 is a right side view, the left side being a mirror image thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken line showing is directed to environment and accordingly forms no part of the claimed design, and the surface shading is only provided to illustrate contour; it is not an indication of texture, gloss, etc.