We use these glasses everyday in the cafe... Set of double wall ice/hot tea glass can be use the whole year round. You can use them for your cold drinks in summer and hot drinks in winter. They are made of a very strong but yet light weight glass (borosilicate glass). They can safely go in the dishwasher and microwave. No coaster needed. Bodum's insulated glassware is made from durable Borosilicate glass. Borosilicate glass is a strong heat-resistant glass that weighs less than traditional glassware. Used to make scientific lab glass, borosilicate glass (medical grade glass) is stronger than traditional "soda-lime" glass and can be used for everything from drinkware to cookware.  Sold in  set of two 6-8oz glasses ( depending on availability can be replaced with similar Assam double wall glasses).

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