FIG. 1 is left front perspective view of a mask, in a folded position with a strap removed, showing the present design;
FIG. 2 is a right rear perspective view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a front view thereof;
FIG. 8 is a rear view thereof;
FIG. 9 is a left front perspective view thereof, shown in an unfolded position;
FIG. 10 is a rear right perspective view thereof, shown in an unfolded position;
FIG. 11 is a top view thereof, shown in an unfolded position;
FIG. 12 is a bottom view thereof, shown in an unfolded position;
FIG. 13 is a left side view thereof, shown in an unfolded position;
FIG. 14 is a right side view thereof, shown in an unfolded position;
FIG. 15 is a front view thereof, shown in an unfolded position;
FIG. 16 is a back view thereof, shown in an unfolded position;
FIG. 17 is a perspective view thereof, shown with the strap installed; and,
FIG. 18 is a right side view thereof, shown worn by a mannequin.
The broken lines showing the mannequin in FIG. 18 illustrate the environment of the claimed design and forms no part thereof.