Strap for Mask

FIG. 1 is a perspective view of a strap for mask showing our new design; FIG. 2 is a front elevation view thereof; FIG. 3 is a rear elevation view thereof; FIG. 4 is a left side elevation view thereof; FIG. 5 is a right side elevation view thereof; FIG. 6 is a top plan view thereof; FIG. 7 is a bottom plan view thereof; and, FIG. 8 is a perspective view shown the state of use. The broken line showing of a mask in FIG. 8 depicts environmental subject matter and forms no part of the claimed design.