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The double-walled glass actually works—I brewed a rooibos right after a black tea and the outside stayed cool enough to hold without a coaster. The silicone coating on the rim is a nice touch, too, since I tend to knock things over.

I love how the stainless steel filter lets me brew loose-leaf tea right in the cup without any mess. The glass is crystal clear so I can watch the color develop as it steeps.

The double-wall glass really does keep my fingers safe even with boiling water, and watching the tea steep through the clear sides is oddly satisfying. Only gripe is the steel filter holes let a few fine leaves slip through, so I still get bits at the bottom of my cup.