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Double wall glasses are truly multifunctional. It is a perfect glass line for people enjoying a whole range of beverages, from ice cold drinks to espresso or cafe latte. A patented silicone vent at the base of each of Bodum's 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.