The insulation is amazing! I wanted a bottle to keep my tea warm, and this is too good. The first time I used it, I poured freshly brewed tea because I thought that it would get a bit colder with time. Well, I was wrong! I couldn't even drink my tea that day because 3 hours and a half later it was still pipping hot! So now I brew the tea and wait a while to pour it in the bottle. That way, it's still hot but not scalding when I want to drink it. I haven't tried it with cold drinks but I suppose it would work just as well. The bottle doesn't get hot, but the cap does heat up a little. It also has a removable metallic filter which I don't use for tea but I think it could be very useful with other beverages. As a downside, the bottle is a bit bigger than I expected, and the black plastic strap that ties the cap is a bit cumbersome. But I'm very pleased with it and I think it works perfectly. Plus, the metallic blue colour is quite pretty. Recommended!
