FIG. 1 is a perspective view of the protective mask of the subject design.

FIG. 2 is a left side view of FIG. 1.

FIG. 3 is a right side view of FIG. 1 (a mirror image to FIG. 2).

FIG. 4 is a front view of FIG. 1.

FIG. 5 is a back view of FIG. 1; and,

FIG. 6 is a top view of Figure.

The broken lines showing a fabric collar is for illustrative purposes only and forms no part of the claimed design.