The Stainless King has its vacuum made in a temperature of over 1000°C. This method is more effective than using a vacuum pump, which is the most common option. The method is also expensive to use, thus chosen only by brands aiming for the sharpest peak of performance. - Material: stainless steel - Top quality performance year after year - Carry and pouring handle folds flat against the bottle frame for transport and storage - Simple and reliable top with no moving parts - Holds your drinks hot or cold for up to 36 hours - Drinking cup - Electro polished inside reduces taste and smell problems - 10 year guarantee against material and manufacturing flaws