Bodum Canteen Double Wall Mugs, 4-piece Set (13.5 oz Hand-blown by skilled artisans, this clear glass canteen mug creates a delightful optical illusion—your London Fog latte or iced American 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. Bodum ® 13.5-oz. Canteen Double-Wall Glass Mug 5.62"height 3.75"dia. Hand-blown Borosilicate glass Silicone valve Double-walled construction 13.5-oz. capacity Dishwasher and microwave safe