Review on PunPun Double Wall Insulated Glass Espresso Cups: Set Of 2 Demitasse And Iced Coffee Cups by Allen Wagner

I have bought several of these and also given them as gifts. They are less likely to break than other brands that I've had. They are the perfect size for my Nespresso pod coffee. Having said that, they still have issues. I noticed today that there is condensation and even water in the airspace in one of the cups. I can only assume that the seal at the bottom of the cup has given way. I think it's still functional--it just looks awful. But I just noticed on this page that the manufacturer doesn't recommend putting it in the microwave. It's a given that some time or other, your coffee gets cold and you want to heat it up. I think I'll just continue to do what I've been doing (microwaving and dishwasher) as all 4 have lasted for over a year. If they break, I'll have to purchase more, this brand or another.