A stewing kettle is actually a small insulating kitchen utensil that can keep heat better than a thermos cup. It not only keeps heat but also keeps cold, so it can be called a stewing kettle. Our family bought a Taifu high stewing kettle. The cold beer I brought with me when I went out in the morning, and there were still ice cubes at noon, but they hadn't melted very much. How is the insulation effect?