ovalware 500ml Double Wall Glass Coffee Mugs, Single Lip Mugs Made of Durable Borosilicate Glass, Insulated Coffee Mug with Handle for Hot and Cold Drinks - Clear

Very nice. I hope they hold up.

I brew tea at either 160 or 212 (for herbal or black respectively) but I don't like drinking my tea at those temperatures. So a thermos doesn't work for me because it does it's job too well. And a regular mug I forget about until my tea is cold. This keeps my tea warm but also allows for the tea to cool so I can actually drink it. Whatever feature makes it so I can feel the heat before I drink (I think it's the double lip wall?) is great. My tea cools down slowly and no more scalding my tongue to learn it's still too hot. The product description says it's sturdy but I haven't put it to the test. It does feel like real glass on the outside, so I'm not sure how durable it is. But I've been careful with it because I love these mugs. They're also so big I am able to brew two tea bags at a time. I will likely buy more of these in the future. I really like them!

Very good for heat retention and not hot to hold. Problem with having a short life before liquid seeps in the inner layer. Not safe to use because you don't know where the liquid is coming from. The drink or the washing. both mugs are now not useable and have not lasted about nine months. Very expensive item for such a short life span.

Drinking water and hot beverages from this mug taste so much purer than from my old ceramic mugs and stainless steel bottles and mugs. This glass mug holds almost 17 oz. It's made of durable borosilicate glass that's dishwasher safe. Though it doesn't keep my morning tea hot as long as an expensive stainless steel-lined mug, this mug is double walled for insulation, helpful if you enjoy lingering over coffee or tea. These days, I'm cautious about drinking acidic and hot beverages from ceramic and stainless steel due to reports of unhealthy substances possibly leaching from those materials, and that's much less likely to happen with glass - plus the taste is purer.

It won't hold a 16-oz bottle of water when making tea. 500 ml = 16.9 oz. Go figure. Microwave-safe is good, though. And it's comfortable to hold.