Contessa Espresso Double Wall Mug, Set of 2

These two walls of borosilicate glass create an insulating layer of air. This double-wall feature allows your morning beverage to stay hot and delicious, and the glass always feels cool. These double-walled and insulated borosilicate glass pieces are heat-resistant and microwave-safe. Perfect for all drinks like cappuccino, coffee, tea, latte, and espresso.