From Theology comes an incredible new line of glassware that makes a bold statement. Made of durable, heat-resistant, mouth-blown borosilicate glass of the finest quality, the Luna is perfect for tea and espresso lovers alike. Borosilicate glass is stronger than common glass. It is shatter-resistant and resistant to high heat. This teacup is the same glass used in making beakers and other chemistry equipment. The double-walled design insulates drinks at their ideal temperature and suspends drinks with a unique floating effect. The glass is condensation-free and does not get hot to the touch when filled with hot beverages. The luna glasses are dishwasher, microwave, and freezer safe.