The tumbler is made of food grade 18/8 stainless steel. Double-Wall vacuum technology keeps your favorite beverage hot or cold for hours.Any drink that is hot, like coffee, can stay hot for up to 6 hours. Cooler drinks, like coke, can stay cold for up to 24 hours. Colored powder coating gives the container a textured and vibrant finish, a special treatment that minimizes fading and chipping and provides you an ultra solid, anti-slip grip! Non fading & long-Lasting Powder coating keeps its stay colorful finish and look more elegant, especially. It comes with a leak proof lid and reusable straw which both are BPA-Free.The sliding lid can be easily closed to prevent leakage and spatter, no need to worry about the drink in the cup flowing.