Coffee or tea mug manufactured in double walled borosilicate glass.The transparency of the mug allows for total appreciation of the coffee’s colour and creamy topping. It nicely highlights the amber tones of tea. Borosilicate glass is highly resistant to thermal shocks. Its chemical composition maintains unaltered the level of acidity of any liquid or food it contains. The vacuum area between the two walls allows for thermal insulation and prevents condensation on the outer surface. As a result the temperature of hot or cold liquids and food is maintained longer.