Perfect for keeping your soups and drinks hot, the Stainless Steel Vacuum Flask from John Lewis also ensures cold drinks stay refreshingly chilled during the summer months. With double wall vacuum insulation for great temperature retention and a leak-proof stopper, it will keep your drink hot or cold for up to 8 hours. The food grade, unbreakable 304 18/8 stainless steel construction is cool to the touch when using with hot liquids and sweat-proof when using with cold ones.