Protective Mask

FIG. 1 is a front view of a protective mask, showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof; and,

FIG. 5 is a left, front perspective view thereof.

The broken lines show portions of the protective mask that form no part of the claimed design.