Amazon.com ReviewBodum's Assam drinkware captures the imagination with a fresh, ultra-modern design. The walls of each vessel are actually two layers of clear borosilicate glass, creating an optical illusion that the liquid floats freely inside. Used for scientific lab equipment, borosilicate is exceptionally strong, lightweight, and thermal, so it translates perfectly to busy households. Assam's shapes create a smooth and sophisticated setting, with slightly concave sides that flare out as they reach the rim. Winner of the prestigious European IF Design Award, double-wall glasses go safely into the dishwasher and microwave. Because the glasses are mouth blown, each one may have slight variations. The inner wall should be protected from sharp or heavy objects.