Our double-layer vacuum insulated travel mug can keep hot and cold liquids (Water,Coffee,Tea) at low temperature for 12 hours and keep warm for 24 hours.The Thermo cup is made of food grade 316 stainless steel,vacuum inner tank, with heat preservation and cold preservation effect,double electrolyte inner wall.It is made of BPA-free materials and can be safely.The cup lid is made of polypropylene, ABS resin and silicone gasket.Our stainless steel vacuum flask is very suitable for daily use and can be taken with you,such as hiking,camping travel,school or company,Put the portable hot drink cup in the side pocket of your backpack or as a daily companion to help you stay healthy and hydrated.