22 oz. capacity stainless steel, double wall vacuum tumbler. Insulated to keep hot drinks hot up to 12 hours and for cold drinks, keeps ice up to 24 hours. The crystal clear lid shows exactly how much drink is left. Easy to clean with an air tight lid seal and a no sweat exterior to keep the outside dry.  Strong construction from 18/8 stainless steel. Designed to fit in most cup holders.