The body of the thermos is made of high-quality stainless steel. There is vacuum insulation between the walls of the thermos. The thermos is designed to meet all the requirements for an outdoor bottle: easy and quick opening and closing, impact resistance and high insulation performance. Button closure for simple and quick operation. 1- press to open the cap, 2- press to close the cap. Keeps hot: 18 hours Keeps cold: 24 hours