“My spine, my neck and my pockets...who could ask for more? I'm always cold even in moderate temperatures outside and this vest has enabled me to not look like a snow bunny in all my fleece jackets. I can actually even where a long sleeve shirt with the vest and be comfortable because all the right spots are warm! Wish the battery was a lighter. It's a bit bulky in the pocket. It would even work if it was simply thinner and a little bigger in demension.”