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Coffee Joulies, Set of 5

2.5 out of 5 stars 173 customer reviews

Currently unavailable.
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  • Coffee is HOT; Joulies are cool; Take the edge off your coffee so it is safe to sip sooner and stays in the perfect temperature range longer
  • Polished 18/10 stainless steel shell - just like high end silverware
  • Food-based and completely nontoxic phase change material sealed inside absorbs and releases heat from your coffee
  • Keeps your coffee at 140°F (60°C) - the perfect drinking temperature
  • Made in USA from 85% recycled stainless steel using hydro power from Niagara Falls

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As seen in The New York Times, WIRED, Gizmodo, ABC News, Popular Science and more. Is your coffee is too hot? Use Joulies to cool it down and keep it perfect. Tired of burning your tongue on coffee only to have it get cold a few minutes later? With Coffee Joulies your coffee will be ready to drink faster and will stay hot longer. This works thanks to a special material sealed inside the polished stainless steel shell called a "phase change material" that is able to absorb a large amount of energy as it melts at a specific temperature. We use a PCM that melts at 140 degrees Fahrenheit, which we have found to be the perfect temperature for drinking any hot beverage including coffee, tea and hot chocolate. This material is food-based and completely nontoxic. Each Coffee Joulie works with 4 ounces of hot beverage, so toss one in your espresso, two in your double-short vanilla latte, three in your tall drip, four in your vacuum thermos and five in your venti or xl coffee right when it's poured. The material sealed inside the Joulie will begin to melt, absorbing energy from your coffee and cooling it down to the right temperature, 140 degrees Fahrenheit, three times faster. When your coffee reaches this temperature the process reverses. The phase change material begins solidifying, releasing the energy it stored earlier back into your coffee, keeping it hot twice as long. When used in a high-quality vacuum thermos, Coffee Joulies can keep your coffee in the right temperature range for over five hours. Coffee Joulies set includes set of 5 Coffee Joulies (made in the USA), Joulies logo carrying pouch, instruction card.


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