Double walled, Borosilicate material, Insulated glasses can withstand temperatures ranging from -30 degree C to 400 degree C! you can enjoy your cup of coffee, espresso, cappuccino or tea warmer longer. When you have hot coffee, you won't feel hot from outside and when you have cold drink, there is no condensation on the glass and table. , , Double insulated coffee mug give an extra luxury look in your kitchen or on your dining table. It's more heat-resistant, high transparency, thinner and light weight, but more durable than normal glass. Keep your fingers safe and cool with heat resistant and double wall glassware, so beverages stay warm without you getting burnt! The outside surface always feels comfortable in hand.