Durability meets beauty with the Good Citizen 12 oz Double Walled Smoke Glass Mug. This premium borosilicate thermal shock resistant glass mug keeps your coffee and tea warm with a double-walled, long-lasting insulation that stays cool to the touch. Save your tabletops from rings with these double-walled glass mug that won't "sweat" while you cool off with a cold drink. Made from colored, not dyed, glass so this mug won't chip or peel. Dishwasher safe, not safe for microwave use. Made for Good Citizen Coffee Co, based in Nashville, TN.