Add European charm and modern innovation to every sip with these DOURO Double Wall Mugs. Each mug is expertly crafted from heat-resistant borosilicate glass, and is individually mouth-blown, combining innovative function with timeless style. The double-wall construction regulates the temperature of your beverage of choice, keeping hot drinks hot and cold drinks cold, while a discreet silicone vent at the base of the mug regulates the internal pressure to reduce the risk of cracks and eliminate messy condensation - making them safe and comfortable for wrapping your hands around while savoring your morning coffee, afternoon tea, or bedtime cocoa. Gorgeous and ingenious, the DOURO Double Wall Mugs are sure to be a beautiful and lasting addition to your drinkware collection. 4.76" L x 3.5” W x 6.1" H (each) Double-Wall Thermal Construction Heat-Resistant Borosilicate Glass Dishwasher Safe Microwave Safe