perfect in the cold, besides I had another one from the same company that I lost... however, I don't know in the heat due to its construction if the taste is altered and the cap which is made of silicone... we'll see

Quality construction but like all similar products with double walls, it requires caution against impacts. The thermal insulation (for cold water) is satisfactory, but I recommend choosing the Inox version as the colored versions will eventually get scratched and those areas will be visible. Inox is better for those who are less careful and also because darker colors tend to absorb more heat from the sun in the summer. Now, back to the topic of impacts and durability... The larger the capacity of the thermos, the heavier it is when full, so a strong impact or drop can be fatal for the insulation as the double wall may "break" at the joint. Of course, this is something that can happen with any similar technology or construction of a water bottle. I know this because it happened to me, and even though it had been 2 years and the bottle was obviously damaged and out of warranty, the dealership in Greece offered me a discount, so I bought it again. When you buy a quality product and the dealership supports it in this way, I think it's worth the purchase. 4 stars instead of 5 for the loss of thermal insulation, although I believe it was due to an impact for which I am responsible. However, at this price, I think they could have done an even better job in terms of durability.