The opening of the cup is wide, so it is easy to wash deep when you wash it, and the inside of the cup can be drained cleanly, so you can always use it clean. The design is simple but easy to hold, and the bottle is easy to use for both office and outdoor activities. The vacuum insulated design of stainless steel thermos, so it retains heat and cold, making it the perfect mug for holding hot or cold beverages, such as hot coffee or iced coffee. It won't sweat even when filled with cold beverages, so you don't have to wipe it over again. You can rest assured that even if you fill it with hot beverages, the temperature will not transfer from inside to outside. The cup cover has rubber silicone to effectively reduce leakage. Vibrations that occur during driving or at home cause liquid overflow in the cup and rubber sealing rings provide constant protection. It is also suitable for many other occasions, it is a good choice for home, travel, and to work. The thermal cup is made of food grade 316 stainless steel, which is eco-friendly and healthy, and has excellent heat and cold resistance than other materials. This is for professional & personal use.