Amazon.com Review:

With futuristic looks and high-tech construction, Bodum's Pavina drinkware makes an exciting departure from traditional glassmaking. Each vessel is crafted of 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. The double walls also make the glasses heat-resistant and condensation-free-so hands and tables and stay safe. Winner of the prestigious European IF Design Award, Pavina's shapes are cheerfully rounded and versatile in size to suit many serving needs. Because the glasses are mouth blown, each one may have slight variations. The inner layer should be protected from sharp or heavy objects. Pavina goes safely into the dishwasher and microwave.