It is warm and friendly to give someone a vacuum flask as a gift. It is said that drinking warm water is beneficial to our health. Especially in winter, the elderly and children need to drink more warm water to prevent cold. Additionally, the vacuum flask can keep the water hot for several hours, so it is highly suitable for people who like to take a trip or have camping. Main material: stainless steel – Large capacity The capacity of the bottle can meet your daily requirement. – Keep beverage hot or cool It can keep the content hot or cold for a long time. – Filter You can use this bottle to brew tea, and the filter will help remove the leaves. – Anti-slip There is a piece of anti-slip rubber at the bottom. – Lanyard The lanyard is tightly attached to the flask, thus making it convenient to carry. – Cap The cap also can serve as a water cup. Efficiency: – Hot water If a full bottle of 100 Celsius degree water is placed in room temperature, it will be 72 Celsius degree 6 hours later, 57 Celsius degree 9 hours later and 42 Celsius degree 12 hours later. – Cold water If a full bottle of 0 Celsius degree water is placed in room temperature, it will be 6 Celsius degree 6 hours later, 12 Celsius degree 9 hours later and 16 Celsius degree 12 hours later.