This double wall glass cup design prevent the temperature from reaching the palm of your hand. In summer, cold drinks, are not cold, hot drinks, are not hot in winter, just one cup. It is equipped with a silicon sealing cover, anti spill design, safe to use, when the cup lids and movable buckle are closed. It is made of high borosilicate glass material. It can be used for coffee, milk, juice, tea etc. It can be used in microwave oven