At first I thought they were not that good, but they do heat up. I still think there needs to be at least one higher level of heat. However, If the highest level of heat only last 3 hrs, a higher heat would certainly shorten that time significantly, and the battery pack is already kind of big, so not sure if i would buy these again. I was thinking about sending the socks back, but I think I will keep them. I feel this product needs improvements, but they are not bad. The socks are very thick, and seem to be pretty nice quality.
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