® Double Walled Mug, 15oz/450ml, black, stainless steel. The rustic acacia wood lid and wire handle give an artisanal feel to this collection of Cafe Culture double-walled coffee mugs. Double-wall captures air to create a vacuum layer of thermal insulation. Keeps coffee hotter and longer than standard mugs, while the outside layer remains cool to the touch. The lid doubles as a coaster and the 15oz/450 ml capacity are perfectly designed to enjoy a cup of your favorite freshly ground coffeehouse blend.