The ornamental design for an insulatingsleeve for a beverage container, as shown and described.
FIG. 1 is a front perspective view of an insulating sleeve for a beverage container, showing my new design;
FIG. 2 is a front view of the insulating sleeve for a beverage container;
FIG. 3 is a back view of the insulating sleeve for a beverage container;
FIG. 4 is a right side view of the insulating sleeve for a beverage container;
FIG. 5 is left side view of the insulating sleeve for a beverage container;
FIG. 6 is a top view of the insulating sleeve for a beverage container;
FIG. 7 is a bottom view of the insulating sleeve for a beverage container; and,
FIG. 8 is a front perspective view of the insulating sleeve for a beverage container and illustrates an example beverage container contained in the insulating sleeve in broken lines.
The broken line showing of the beverage container in FIG. 8 is for purposes of illustrating environmental structure and forms no part of the claimed design. The broken lines that depict stitching on the insulating sleeve for a beverage container do not form part of the claimed design. All other broken lines depict portions of the insulating sleeve for a beverage container that form no part of the claimed design.