Hand-blown by skilled artisans, this clear glass canteen mug creates a delightful optical illusionyour cappuccino, affogato or Mint Julep appears to float within. The double-walled cup-within-a-cup design helps keep your drinks at the ideal temperature and prevents condensation. Finished with a slender handle, the elegant-yet-durable borosilicate glass mug stands up to heat and cleans easily in the dishwasher.