The Asobu Insulated “On the Rocks” Black Insulated Sleeve is ideal for keeping your liquor chilled, whether on the rocks or “neat.” The slim double-wall vacuum insulated sleeve fits over the standard US made straight-up Old Fashion rocks glass (1 included). It will keep your drink chilled and is ideal for serving scotch, bourbon, vodka, gin, rum or other liquors straight up, with ice, or a mixer.