I picked up the Insta-Chill Slim Can Sleeve set of 3 and they work well for 12 oz. slim cans. You freeze them for at least an hour, then wrap them around your drink with the velcro. In about 10 minutes a room temperature can gets noticeably colder, and cold cans stay chilled for hours. The neoprene keeps my hands from getting too cold and they store flat. Hand wash only, which is fine. One star off because you need freezer space and planning ahead.