Double-walled construction eliminates drinks that are too hot or too cold to carry by containing temperature in the interior of the thermal mug, keeping the exterior wall right at room temperature. Versatile in every way, these mugs can pop in the microwave to reheat your coffee or in the freezer to chill your smoothie and then simply slip in the dishwasher for a low-maintenance finish, Bodum Bistro Set of 2 Thermal Double Walled 15 Oz. Glass Mugs, Other, Dining Categories - Glassware & Drinkware