An insulating seal member adapted for use in association with a pair of beverage cups including an annular body, wherein the annular body includes: an upper region having an inner surface, an outer surface, and a top surface; a lower region having an inner surface, an outer surface, and a bottom surface; and an intermediate region positioned between the upper and lower regions; wherein the top surface of the upper region is adapted to sealingly engage a bottom surface of an annular rim of a first beverage cup; and wherein at least one of a lower surface of the intermediate region and the bottom surface of the lower region is adapted to sealingly engage a top surface of an annular rim of a second beverage cup positioned below the first beverage cup.