The Stainless Steel Thermal Insulated Mug Bottle is a double-walled vacuum-sealed coffee mug that keeps drinks hot or cold for 6 to 10 hours. It is sweat-proof and burn-free. With a 380ml capacity, it is perfect for carrying coffee, tea, or water while traveling, working, or outdoors. The mug is made of 304 stainless steel, which is easy to clean, unbreakable, and safe. It comes in four colors: black, blue, champagne, and natural silver..