The air is a 2-layer tea cup with an air gap in the middle to help prevent heat and keep the water temperature inside. Designed by Plural Designs in a simple but detailed shape, it also shows the exquisite production process of Siam Celadon as well as the natural celadon coating, developed in more than 5 shades, named Green Master Collection, to represent the expertise of Siam's celadon coating and create a new sense of original celadon coating.