Coffee cups can get very hot to the touch, which is why people put cardboard sleeves around them to keep from getting burned. But this Heatswell cup doesn’t need any sleeves, because it automagically grows one when a hot beverage is poured inside. It saves on material and shipping costs, so don’t be surprised to see this show up at Starbucks sometime in the near future.
Heatswell coffee cup grows a sleeve when hot liquid is poured in
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