Made of high quality stainless steel. It has a single wall high quality steel body. Basically it is used to keep in the freezer/Refrigerator but apart from it you can use it anywhere like office, home, kitchen and in the travelling also. This bottle can be used by anyone in your family and you need not to worry about the changing temperatures when you are using the water bottle. This bottle specially designed for cold liquids and beverage. This product should not be used for carbonated drink.