The sides of the Duos Old Fashioned Tumblers are double-walled, creating a layer of air that provides thermal insulation. This design keeps cold drinks colder and hot drinks hotter, longer, while preventing sweating. The two walls of glass also add brilliancy. Duos is an attractive, everyday collection that also makes a unique gift to be cherished for years. Dimensions: H 114mm Ø 90mm « less