The Asobu "Infinite Mug" is a state-of-the-art, double wall, vacuum-insulated, and copper-lined stainless steel. It also includes two stunning new features. One is a unique ceramic coated interior and the other is an extra wide cork base exterior. The scratch-resistant cork base is ideal for sensitive desktops and avoids the need for a coaster. The ceramic coating interior gives you a pure taste and rinses clean extremely easily. Enjoy the infinite comfort and luxury of the incredible Asobu Infinite Mug!