Because the only thing you don't overthink about is whether or not you should have coffee. That one's pretty much always a yes. Our vintage reproduction enamel mugs are made from a thick enamel-coated steel. They are heavy (for enamel mugs--still lighter than ceramic), smooth, wonderful to drink from, and crazy sturdy. Dishwasher safe. These are steel under enamel. So please don't use them in the microwave.