Easy to use, one simply adds tea leaves to the bottom of the tumbler, pours in hot water, waits for 3 – 4 minutes and presses the plunger to stop the brewing process. The tea is ready to go! It can be used to brew French Press coffee too. The double wall design allows your tea or coffee to stay warm for a long time. The specially designed drinking lid is easily flipped off and tightly closed again. It is handy, fits safely into most car cup holders and is light in weight because of the plastic construction.