The Pole is a double wall borosilicate glass bottle which can hold both hot and cold drinks. Unlike regular glass, this will not crack under extreme temperature changes. On the inside is a removable tea infuser/strainer to help infuse the water. The top of the lid has a built-in LED touch thermometer that shows the current temperature of the liquid inside. It is leakproof, so you will have no trouble carrying it in your bag. Battery included. 390ml capacity.