FIG. 1 is a front view of a mask in a folded configuration;
FIG. 2 is a rear view of the mask of FIG. 1 in a folded configuration;
FIG. 3 is a top view of the mask of FIG. 1 in another folded configuration;
FIG. 4 is a bottom view of the mask of FIG. 1 in a folded configuration;
FIG. 5 is a right perspective view of the mask of FIG. 1 in another folded configuration;
FIG. 6 is a left side view of the mask of FIG. 1 in a folded configuration;
FIG. 7 is an enlarged view of the area 7 encircled by broken lines in FIG. 1;
FIG. 8 is a left side view of the mask of FIG. 1 in an open configuration; and,
FIG. 9 is a right side view of the mask of FIG. 1 in an open configuration.
The broken lines shown in FIGS. 1 and 7 are included to identify areas of enlargement and form no part of the claimed design. The remaining broken lines in the drawings define the bounds of the claimed design and form no part thereof.