The bottle is made of high quality two-layer 304 stainless steel with strong stainless steel construction, has nice corrosion-resistance,durability. It's easy to clean. The bottle adopts double wall vacuum insulation technology. With highly efficient heat and cold preservation,the heat preservation time is up to 6 hours and it holds ice for up to 24 hours. The bottle is 100% leakproof. It has 3-way-option-lid:1.Close;2.Drink with straw;3.Drink directly.The 2-way-drinking design makes it more simple and convenient With collapsible & strong handle, it's very convenient to carry out. The function of the thermo cup and the shape of the bottle to take away are perfect for the car, office or on the trip The bottle adopts inner tank electrolysis technology.It's more safe.