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Can I put them in the refrigerator/freezer?

Last Updated: Jan 31, 2013 06:14PM EST
Coffee Joulies can withstand cold temperatures, but because the phase change material inside is already frozen at room temperature you don’t get the benefit of heat of fusion like you would get with ice cubes in cold drinks. That said, if you like Coffee Joulies cooling your hot beverage down and aren’t worried as much about keeping it hot longer starting with cold Joulies will absorb more heat so you could potentially use fewer Joulies and have more room for coffee in your thermos.

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