Our 20oz Insulated Tumbler are made of 2 layers of 304 stainless steel, and its size is 20oz. Our 20oz Insulated Tumbler is designed with double-wall insulation to keep your favorite beverages hot or cold for hours, allowing you to enjoy your drinks at the perfect temperature. Sitting on a comfortable sofa, holding a insulated cup and drinking your favorite drink from time to time, whether you are watching a TV series, reading a book or enjoying a meal, it is your partner for a better life.Dishwasher safe, and have a No Sweat Design to make sure your hands stay dry.Made from food grade stainless steel material. Our cups with lids are built to last and are resistant to rust, corrosion and staining but don't leave a metallic taste or rust. So even the elderly and children can use this therm