Every Borosil Microwavables product that you buy:
Is made of borosilicate glass, and is guaranteed to withstand temperatures of upto 350?C
Can be safely used in the microwave, oven, fridge, freezer, and dishwasher
Unlike plastic and melamine, will not leech chemicals into your drink even over repeated usage
Will retain 100% clarity. Unlike regular soda lime glass, will not turn milky or cloudy with time.