Single Wall Stainless Steel fridge water bottle, Inner and Outer side of Bottle is made from high grade Stainless Steel 304 which is Rust Free, Odor free and 100% Food Grade. Basically it is used to keep in the Freezer/Refrigerator also you can use it in Office, Home, Kitchen, School, Gym, Trekking, and in All kinds of Sports Activities. This bottle is easy to clean and maintain -Use Mild Soap for cleaning the Bottle and advised to be kept open when not in use to avoid odor.