Recharge with a heartfelt cup of coffee, this double wall friendship glasses set of 2 is mouth blown and can be used for cold or warm beverages. Its unique design is appealing to the eye when filled with your favorite beverage. With its double layer of borosilicate glass, it appears as though the liquid is 'floating' within the glass. The double wall creates a thermal effect, helping to keep your cold drink's cold and your hot drinks hot for longer periods of time. These mouth blown glasses are an exciting product for any home, restaurant and cafe, and they are a definite conversation piece. Mouth-blown of 2 layers of lightweight, durable borosilicate glass keeps drinks insulated, wont form condensation on outside dishwasher and microwave safe