One of the primary advantages of double layer glass cups is their exceptional insulation properties. The two layers of glass create an air pocket between them, which acts as a barrier, preventing external temperatures from influencing the contents of the cup. This means that hot beverages, such as coffee or tea, stay hot for longer periods without burning your fingers, while cold drinks, like iced tea or cocktails, remain chillingly refreshing without the risk of condensation on the exterior. This dual functionality is perfect for those who want to enjoy their beverages at the optimal temperature without discomfort.