The ornamental design for a supportbelt for a headband for ear noise reduction, as shown and described.
FIG. 1 is a support belt for a headband for ear noise reduction showing my
new design;
FIG. 2 is a plan view from the opposite side thereof;
FIG. 3 is a side perspective view thereof; and,
FIG. 4 is a perspective view shown curved in use, the headband shown in
broken lines is for illustrative purposes only and forms no part of the
claimed design.