I got something like those for my wife, as it seemed we were only getting a run or two of skiing before she needed to warm up in the lodge and I'm used to going for a few hours at a time.
They worked well enough to get another run or two in before she needed warm up time, as long as we were smart enough to remember to bring batteries, on the plus side, they will add a shot of baileys to your coffee in the starbucks at sunshine, so i got to have one or two "cowboy coffee's" in the morning with her required warm up breaks.
If your needing these for winter or hiking boots, I'd suggest getting better boots though. Ski boots are a bit different.
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feeding the occasional troll.
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