The cup with a lid will keep your green tea warm.
Japanese teacups don't have a handle, so if you fill them with boiling water, they are too hot to hold.
The reason why there is no handle is because the proper temperature for green tea is 60-80 degrees Celsius, so it's not so hot if you hold it directly.
There is also a culture in Japan where people hold the cup directly and enjoy the texture.
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