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Coffee Temperature Regulator

These stainless-steel capsules regulate the temperature of hot beverages, provided that you use them in a travel mug.

What We Learned

Freshly brewed coffee can start out too hot to drink—and can too soon end up cold. Enter Coffee Joulies (“JOO-lees”), stainless steel capsules shaped like oversize coffee beans and filled with a proprietary material. The product promises to cool your coffee quickly to the ideal temperature (140 degrees) and keep it there.

We bought a set of Joulies for $49.95, which includes five J...

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