Milton Thermosteel water flask is made from 18/8 stainless steel. This Insulated double walled vacuum water flask is designed for maximum temperature retention that keeps your favourite drinks hot/cold without altering their temperatures for a prolonged period of time. It will keep your drinks just the way you need them throughout the day. The taste and nutritive value of the drinks remains intact for a long time making the flasks very appropriate choice for storing beverages. 100% Food grade Stainless Steel: Milton as a brand, not only design products that are aesthetic in looks, but also products that are non-toxic in nature made up of food grade material.