Great, simple, affordable design that works very well
Very good, efficient, and affordable. Not too thick so they don't crowd my feet in my boots. Plugged them into a separately purchased rechargeable 5 volt 2 Amp power brick with a built in switch which I can keep in my pocket. I can easily reach into my pocket to turn the power to the liners on and off as needed for heat. The Y-shaped cord that comes with the liners is easily long enough to reach from my pocket into my pants and down my legs to plug into the short cord attached to the liners. I stitched a small loop of waistband elastic to the inside of my boots in a location where the cord would not bother me. It holds the end of the cord attached to the liners to keep the plug in place and make it easier to unplug the long cord from the liners to take my boots off. I can slip the plug out of the elastic if needed. I was so happy with them that bought a second pair of liners for my big snow boots because they are so affordable and so I don't risk damaging them regularly transferring them from one set of boots to another. It's nice to be able to power them with something I can use for other devices, too.
Rating: 5 stars