Many mugs are synthetic of ceramic materials such as earthenware, bone china, porcelain or stoneware. Some are unreal from strengthened glass, such as Pyrex. Other materials, including plastic, ready and enameled nail it are worn where break resistance is at a premium, such as for campers. Techniques such as silk screen printing or decals can be not new to apply decorations; these are fired onto the mug to ensure permanence.
The mug stores some hot spell from the beverage, and so prevents it from cooling too quickly. The form of Photo Mugs a mug helps insulation: (i) thick walls separate the beverage from the biting external air, and (ii) an indented base separates the beverage from the surface upon which the mug is set. The shape of the base forms the characteristic O-shaped stain, so often seen upon desks and documents.