Bodum's unique glass-in-glass technology is re-interpreted in a new rounded shape. Two lightweight layers of glass are blown together to create a vacuum layer of thermal insulation. These glasses keep hot drinks hot without burning your hands, while ice-cold drinks stay cool without the hassle of condensation. There will be subtle variations due to the handmade nature of these glasses.View all Bodum products. Insulated double-walled glass. 2.5 oz. Handmade of lightweight borosilicate glass. Dishwasher- and microwave-safe. Imported.