Double walled 18/8 Food grade Stainless Steel, Liquids stay hot & cold for long hours, Copper coating inside for longer Heating or cooling Hours, Ideal for storing water, tea, coffee, Juice etc., Easy to pour the liquid, Stain proof Body coating.Precondition your SS Vacuum Bottle with Hot water, if using for hot liquid and with cold water if using for cold liquid. Do not use for storing carbonated drinks. Fill the Vacuum Bottle completely for better results. When not in use keep your Vacuum Bottle lid open to avoid odour. Very handy for office, home, hospital.