Innate Cha Vacuum Bottle (350ml/12-Ounce, Stainless) Vacuum bottle construction made with premium type 304, 18/8 stainless steel Keeps liquids warm up to nine hours: preheat with hot water for best results Push-button valve integrated into stopper for easy pouring Proprietary ergonomic cap doubles as drinking cup and features extra insulation to keep liquids warmer longer