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
My Husband uses these for hunting. He says that they keep his feet warm while sitting for a long period of time, They are not hot, just right . But the sizing could be better as he has to push them to the front for his toes, but it does not bother him or feel funny in his boots when walking.
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