Milton Thermosteel water bottle is made from 18.8 stainless steel. This Insulated double walled vacuum water bottle is designed for maximum temperature retention that keeps your favorite 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 Bottles very appropriate choice for storing beverages. 100 Percent Food grade Stainless Steel: Milton as a brand.