In a Keko drinks stay ice cold for 24 hours and piping hot for 12 hours.
Keko is constructed of two walls of 18/8 nonporous food grade stainless steel. This means it won't absorb flavors like coffee, tea, or soda and doesn't taste like metal.
Between the two layers of stainless steel is a vacuum insulation that does not transfer hot or cold. So if you drop your Keko, don't worry there is no glass liner to break.
Keko is a bottle that you can leave in a hot car or on a sandy beach in direct sunlight all day and still have ice cold water. If you prefer hot drinks, Keko will keep them hot in those freezing temperatures.