Amazon.com With futuristic looks and high-tech construction, Bodum's Pavina drinkware makes an exciting departure from traditional glassmaking. The walls of each vessel are crafted from two layers of clear glass, creating an optical illusion that the liquid is suspended inside. Softening the look, Pavina's shapes feature smooth, rounded silhouettes. The inner wall also curves slightly away from the outer wall for a touch of understated elegance. This set of two double wall thermo-glasses keeps any beverage from icy lemonade to hot cocoa at an ideal temperature. Crafted of borosilicate glass, which is also used to make scientific lab equipment, the 15-ounce pair is also exceptionally strong, lightweight, and durable. The two-layer construction resists heat and prevents condensation, so the outside remains comfortable to hold and safe for any tabletop. Winner of the prestigious European IF Design Award, this scratch-resistant set goes into the dishwasher and microwave. Mix and match Pavina with the Assam and Canteen lines to stock the bar or dining table with a variety of fun shapes. --Kara KarllEditor's Note: Because the glasses are mouth blown, each one may have slight variations in height, thickness, and weight. Bodum recommends using care when placing ice into the glass to avoid fracturing the inner layer. Do not use metal spoons or place the glass into a crowded dishwasher. Product Description A silicone vent at the base of each Bodum double wall glasses equalizes the air pressure between the two layers of glass when either hot or cold liquids are added. Permeable only to air, never water, The vent enhances durability and will never allow liquids to enter between the two layers.