a double walled container is provided for insulating a beverage . an outer insulating shell or container is secured to the inner container that holds the beverage . a gap exists between the outer container and inner container and the air in the gap acts as an insulating barrier . the inner container is preferably a standard aluminum container . the outer container is preferably made from aluminum or a plastic polymer . the outer container may have annular or longitudinal grooves that assist in securing the outer container to the inner container , and the grooves may also provide an enhanced gripping surface as well as a visually pleasing aesthetic design . the outer container may include a base , or the base may be eliminated in favor of a sleeve configuration for the outer container .