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These are slip-on house slippers with a carbon-fiber heating element in each footbed, powered by a USB plug from a laptop, power bank or 5V adapter. They warm to about 42°C and hold a steady temperature, and the EVA heating insoles can be removed so the slippers can be washed. The knit wool and cotton fill suit cold feet at a desk or on the couch. Against plug-in heated foot warmers, they run on low 5V power and go anywhere a USB port goes, but they need a cord and must rest after three hours of use.
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Lowest price we've seen: $9.99 on Nov 15 at Amazon. Tracked across 1 store since Nov 15.
These are USB-powered heated slippers that slip on. The outer is knitted wool with warm cotton filling. A carbon fibre heating element warms the feet and runs on low power at 5V.
The slippers heat to about 42 degrees at a constant temperature. Heat is proportional to the current, so a different power adapter changes how warm they get. They plug in by USB to a PC, notebook, power bank or power transformer.
The EVA heating insoles are independent and the slippers are washable. Run them for no more than three hours at a time, then wait twenty minutes before using them again. Stop using them if your feet get too hot. Do not use an adapter over 5V or over 2.2A.
