Your collection of mugs may be beautiful, but chances are they're all porcelain and probably can't brew a single serving of loose-leaf tea on their own. This all-in-one cup is made of high-quality borosilicate glass with a stainless steel filter insert that gives your tea leaves space to steep. Speaking of, the sieve protects the complex flavor of high-quality tea and keeps the leaves from your mouth while you drink. Finally, the included lid lets you bring it with you if you don't finish your mug in time. Put it all together and you've got a tea-drinkers dream vessel.