The Solo Stove is made from 304 stainless steel, which will eventually rust if you leave it exposed to the elements. Store it in a cool, dry place between uses or cover it with its shelter (if you plan on leaving it outside year-round) to prevent moisture from collecting on it. It's totally normal for Solo Stoves to develop a yellowish tinge (patina) after being exposed to high heat, but if you hate the look of it, you can restore it to its original silvery shininess with some Bar Keepers Friend.