Ultimate Mug from Asobu combines the style of a classic mug with the functionality of an insulated bottle. Copper lining, ceramic inner coating, and double-walled vacuum insulation maintain the temperature of the beverage for a long time, to the last drop. The mug has also a transparent, removable lid with easy opening and closing. The mug is not leakproof - the lid protects from spillage, but the mouthpiece is not sealed.