The ornamental design for a protectiveheadband, as shown and described.
FIG. 1 is an isometric view of a protective headband.
FIG. 2 is a left-side view of the protective headband of FIG. 1. The right-side of the protective headband being a mirror image of FIG. 2.
FIG. 3 is a front view of the protective headband of FIG. 1.
FIG. 4 is a rear view of the protective headband of FIG. 1; and,
FIG. 5 is a top view of the protective headband of FIG. 1.
The even length broken lines on the protective headband form no part of the claimed design. The dash-dot-dash broken line outline of the partial human figure assists to illustrate the protective headband in a position of use and form no part of the claimed design.