The Assam double wall glasses can be used 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, used to make scientific lab glass, is a strong heat-resistant glass that weighs less than traditional glassware. Borosilicate glass is dishwasher safe and will not become cloudy over time; you can rest assured that after 100 cycles, the glass will be as clear as the day you bought it. Simply treat it as you would any glass product and it will stand up to every day use. Dishwasher & microwave safe.

Each glass has a 13 oz. capacity.