Perfect for tea on the go or at the office, this double-walled glass tumbler stays cold or hot, while protecting your fingers from the temperature within. It comes with an airtight lid as well as a fine mesh steel infuser. To use, simply unscrew the lid, place tea leaves in infuser and add hot water. Once tea has steeped for the desired amount of time, remove the infuser and drink right out of the tumbler. For continuous infusion teas, remove the infuser before adding tea leaves and add water as desired. Holds approximately 10 oz.