Product review (4 stars): Cold Feet Be Gone!
Item as described however, they only warm the bottom of your feet\toes. I was looking for something that warmed the entire foot. On the plus side they can be used with a usb car charger to wear for trips. I wouldn't suggest wearing them driving however. They do better plugged directly into a usb port instead of a usb hub. They do get hot so wearing socks is probably a good idea.