This mushroom-shaped insulated tumbler has double-layer insulation to effectively maintain temperature, and it can keep your beverage hot for up to 12 hours and can be used for hot and cold drinks. With a rounded smooth mouth that fits snugly around the lips, our flask is made from six layers of material that is safe for humans, it will never leave a metallic taste or rust. The large diameter of 2 inches is more convenient for cleaning. The powder-coated look is classic. It ensures you stand out in a very durable and elegant bottle. The mushroom-shaped design is elegant and sophisticated, unique and creative.