Our Coffee Mug is evolved with a round bottom design, made with a two-layer base, and has an excellent thermal insulation effect, keeping your drink hot or cold for a more extended period while the outer glass remains safe to touch; suspends drinks within an inner wall for a pleasing visual effect. It is made from sturdy borosilicate glass, light but strong. Accept the temperature from -30℃ to 150℃; It is more durable than ordinary glass. All glassware is fragile, so please use and clean it carefully. The double wall glass mug is suitable for cafes, restaurants, bars, and your home for daily meals, work for meetings, and parties. Suitable for coffees like latte, espresso, cappuccino, macchiato, or any beverages like juice, tea, or coke.