The Mammoth® 12 oz. Chillski is the ultimate way to keep your canned or bottled drink cold for hours. It is double-wall vacuum insulated which will keep your beverage up to 10 times longer than a standard can holder or koozie. The Chillski is built with 18/8 durable stainless steel. The screw on collar seals the can or bottle securely inside the insulated body, for ultimate insulation.