The Thermal Mug is a double-shell 300ml thermal cup made of high-quality stainless steel and double screw cap. The inner surface is extremely resistant, hygienic and taste and odour neutral. Thermal Mug will keep drinks hot for up to 6 hours or cold for up to 12 hours. For better insulation, the inner shell is covered with a copper layer on the outside. The cap is equipped with a pressure valve.