In addition to the modern design the double-Design should also protect against heat, keep hot drinks warm longer and cold cold longer.
That is the theory.
In my case, I can confirm the former, one finger not verprennt itself. One feels, of course, that even the outer glass heated (inner wall - air layer - outer wall), but it is very moderate. So far so good.
What has disappointed me a bit was the "holding capacity" this is my opinion is not better than normal cups, if not even a little worse. This is in my case the reason for the star trigger.
For durability, I have to say that ICHD ie glasses abspüle by hand, so I do not know if the silicone valve in the dishwasher breaks down quickly or not.
On the plus side is that it is a borosilicate glass, making it much more resistant to temperature changes and resistance (makes to many chemicals - what in the household should not really play a role). Sudden jumps glass etc. should not occur with it.
Because I read the question several times in Forum: Yes, borosilicate glasses may be used safely in the microwave. The only weak point in this case is probably the silicone valve. Where you been here until about 200-220 ° C, must not worry.
Many Greetings!
