About the ASSAM Double Insulated Glasses Add a touch of elegance to your drinkware collection with this set of ASSAM double insulated glasses. A perfect blend of utility and design, these chic, curved glasses fit comfortably into your hand, while their double-wall design produces an optical illusion that makes your drink look as though it's suspended in the glass. Individually mouth-blown by expert artisans, these double insulated glasses are made from two layers of heat-resistant borosilicate glass, which keeps hot and cold drinks at their ideal temperature for longer. A clever silicone vent on the base regulates the external wall of the glass, which prevents messy condensation and means you can hold a glass of hot liquid without burning your fingers. Lightweight to hold and easy to clean, these stylish double wall glasses are available in a range of sizes, making them ideal for serving all your favorite hot and cold beverages. Innovative double wall construction that keeps hot drinks hot and cold drinks cold. Also perfect for serving soup or cold desserts. Made of mouth-blown, heat-resistant borosilicate glass. Hydrophobic silicone vent that equalizes the air pressure between the two layers of glass. Dishwasher, microwave and oven safe (up to 350oF/176oC). Available in a range of different sizes. Use & Care Wash in warm, soapy water before first use and dry thoroughly. For all subsequent uses, wash and dry by hand or pop in the dishwasher. ASSAM double wall glasses are safe to use in the freezer, oven and microwave.