The Ellipse 350 ml insulated coffee mug is made from stainless steel and is leakproof, keeping drinks hot for up to 4 hours or cold for up to 8 hours. With its compact 350 ml capacity, it fits easily into bags and most cup holders. The wide opening makes it easy to add ice cubes, and the exterior stays cool and dry to the touch regardless of the temperature inside. BPA-free.