The whole success is brewing tea leaves with cold water. Just pour your favourite tea, pour it over with cold water and put the bottle in the fridge. This brewing method allows for smooth and rich flavour without hints of bitterness. The filter in the upper part of the bottle keeps leaves inside for clear infusion.
It is also great for preparing flavoured water - just add your favourite fruit instead of tea leaves.
The bottle is made of Japanese glass with a silicone top.