THE PERFECT SIZE! These cups function as a tumbler with the lid on or can be used as a can insulator without the lid!  Perfect for hot or cold beverages, and can help keep your canned drinks cold as well. Tumbler is vacuum insulated and made of durable double-wall stainless steel. Dual wall construction prevents condensation from forming when filled with cold beverages and also keeps the exterior cool to the touch when filled with hot drinks. Includes a clear push-on acrylic lid with a thumb slide closure.