The first time I used the warmers, my feet became Happy Feet! Have not tried them for very cold climate yet...32 degree night only thus far. Will update review after weekend in January in NYC.
I love to snowboard, but my feet start to hurt about 10 minutes in due to the cold. I've been snowboarding for 8 years, and for the first time, my feet don't hurt if I put these warmers in my boots! They work instantaneously and last for my full day on the mountain! WOULD HIGHLY RECOMMEND!
These things work as expected. The intent is to keep your feet at body temperature. I just used these over the weekend on days where the temperature was ZERO... they worked. I like the fact there are no wires (I have ski boot heaters with wires and BIG batteries). The smartest way to use these insoles is to put them on medium to get the maximum time.
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