It is made from durable 18/8 kitchen-grade stainless steel. It features double-wall vacuum insulation to keep drinks hot or cold. The "No Sweat Design" prevents condensation on the outside of the cup. Both the tumbler and its MagSlider Lid are dishwasher-safe for easy cleaning. The tumbler is highly durable and designed to fit in most cup holders. Pre-owned and in great condition!