Greenchef Kiyo Bottle is easy to carry, hold, and fits easily in the side pocket of your bag. Stainless steel vacuum insulation virtually eliminates temperature change by creating an airless vacuum space between two stainless steel walls. Greenchef Kiyo three-layered stainless-steel bottles come with a unique technology that results in an insulation layer that provides better performance and you can keep your beverages hotter for up to 12 hours and colder for up to 24 hours a day under ideal condition. This bottle is made of stainless steel and it is durable, user-friendly, and highly functional.