High Quality Material:This glass coffee mug is 100% borosilicate glass, heat-resistant from -4°F to 302°F, Microwave and refrigerator safe, and easy to clean. It is an ideal drinking utensil at present. Stronger and more durable than ordinary glass. At the same time, borosilicate glass is much lighter than ceramic, Ideal for elderly or children with weak wristsNew Drinking Experience: This elegant double walled glasses are with special roll up rim design. Thinner mouth than regular double-walled cups perfect to match your lip and your tone to taste the flavor of coffee better. The handle is also specially designed to let various size of hands hold this clear coffee mug comfortablyProfessional Double Layer Design: Hot drinks will not burn your hands and cold drinks will not form condensation. No burn marks or wet rings will be left on your especially precious leather or wood table. And also keeps your drinks hot or cold for longer than one layer glasses under the same conditions. Impress your family and guests with the unique two-tiered cup design that hangs your drink from the inside wallWidely Used: Each of the coffee mugs holds 5.5 ounces to the rim, which is small enough to perfect match with espresso machine and coffee maker, perfect for cappuccino, milk, espresso, juice, wine, latte, or tea bag. The air holes in the bottom of the cup balance the air pressure between the inner and outer walls very well. To prolong the life of the coffee cup, hand washing is recommendedBest Gift: Elegant and stylish clear glass with gift box packaging, perfect gift for coffee or tea lovers. Give your loved ones a unique gift on anniversary, Valentine's Day, Mother's Day, Christmas and let them enjoy their coffee to the fullest