💧 The thermos is made of stainless steel with twice the thickness of conventional products and with vacuum insulation technology to prevent outside temperature from affecting the quality of the drink, no sweat outside the bottle. 💧 This is used every day to hold iced coffee, iced water/pot, stewed soup or bird's nest, all good. The lid is extremely sturdy for easy movement 🙂 To keep the durability of the product if you use cold or hot. Keeps cold for up to 12 hours of use. and a very reasonable price, very beautiful design