The bodum 4547 10 assam double wall glasses are made from durable borosilicate glass which is light and robust at the same time and dishwasher safe the large transparent 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 the transparent glasses made of borosilicate glass doesnt cloud not even after years of dishwasher use they can safely go in the microwave no coaster needed dishwasher microwave saf