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.
I work for a MLB team. I tried it out at our fan fest in Jan. It was cold out. The vest kept me warm for 4 hours. I need to get a battery so it will go my whole shift
I have used this product in the past. I have checked many places and overstock had the best price and shipping price around. My order was processed and received in a very timely manner. This product stands up to its word. 5 Hours or more of heat. Great for all outdoor sports in cold weather!
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