Double wall design - Highly effective layer of insulation that keeps cold drinks cold and hot drinks hot for longer. The double wall glass thermal effect will maintain the outside of the mug free of condensation. No need for coasters. Mouth-blown borosilicate glass - Heat resistant glass crafted by expert artisans. Comfortable to the touch - No more burning fingers or freezing hands. No matter the temperature of your drink, the outside surface of the mug will always feel comfortable in your hand. Stunning shapes - Unique aesthetic with beautiful contour that highlights the liquid floating effect. Perfect for a whole range of beverages and designed for ice cream as well. Impress your guests! Safe for regular use - Dishwasher, Microwave, Oven and Freezer safe.