Insulating device

FIG. 1 is a top, front, right perspective view of an insulating device showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines immediately adjacent to the shaded areas illustrate a boundary and form no part of the claimed design. The broken lines showing the remainder of the insulating device illustrate subject matter that forms no part of the claimed design.