The first thing to know is that there is only one heating element which is in the back. Offsetting this, the battery pack rests in the front left, and it heats up as well, which is almost good enough. I ordered a medium which fits comfortably for me at 150 lbs, and gives me room for weight gain.The real problem is that after wearing it maybe 20-30 times, and never washing it, it just plain stopped working. Sometimes it does turn on but then it goes off within a few minutes. It got me through the winter, but I need another model for next year.
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