Keeps Liquids Cold or Hot 304 stainless steel kettle is made of food grade stainless steel With a double-wall design and vacuum seal, our water bottles ensure that your drinking water has condensation and keeps the temperature of your drink in an insulated . Cold beverages can stay cold for up to 24 hours, while hot beverages can stay hot for up to 12 hours.Advanced manufacturing technology ensures your stainless steel vacuum insulated water bottle won't sweat or leak.