Very warm if the power source used is strong enough, the insoles will draw as much power as is available. Standard 500mA USB is only lukewarm, but a 2A power supply makes them toasty warm. Sized large fitting my size 13 slippers no problem. A great addition to ward off cold floors in winter! Don't forget they're plugged in or you can pull whatever you ... Read more
These heat well for me using a transformer (US electric to USB) plugged directly into a wall socket. The included cord is reasonably long although you might want an extension depending on how much you move around at your desk. The 'breakaway' connector can be easily unplugged for a quick walk away from the desk. The pads themselves are fairly inflexible ... Read more
This insoles has a good finish, good building material, the wires are well reinforced, warms quickly in less than five seconds, large heating area for your feet, can be cut to various sizes of shoes, quick connectors do not need to disconnect the usb connectors firm does not fall easily. Can be plugged into a usb adapter or an external battery usb, ... Read more
At last I found a system that keep warm my feet without spend a lot of electric energy. I think this product is ideal for who is working at his/her desktop, or reading a book at the sofa It comes with no options of source. You must plug it into your desktop or laptop computer. it would be wonderful that include a battery for each leg providing lot of ... Read more
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