Take the Met along with you any day. Stay Hot or Stay Cold- Retain the temperature of your chosen beverage for a prolonged period of time. Any drink that is hot, like coffee, can stay hot for up to 6 hours. Cooler drinks, (i.e. lemonade), can stay cold for up to 24 hours. The high-quality stainless steel and the double-walled insulation design ensures beverage can stay either hot or cold over time.