Make a double with the double-walled Rocks Tumbler. Don't worry about your cocktail losing its chill for a full 5 hours, thanks to the vacuum-insulated stainless steel that keeps everything at the ideal temperature. You have to feel it to believe it, with the full powder coating that is durable enough to go from the backyard terrace to the dishwasher. The triple-adjustable lid can be opened as needed and is leak-proof when closed. A non-slip silicone base seals the deal and keeps surfaces steady to prevent scratches and accidents.