I have a large one, I want the lower back to be warm, I can warm the buttocks, middle and shoulders . The inner material was a reflective material that keeps your body heat inside the vest. 3 controls are easily visible and the buttons change color when used. Blue is cold, green is on, and red is hot. You control which area you want to be hot, warm or out of, the pockets can hold a large phone, if you have a USB battery pack it needs to be small or thin, it gets bulky with large items, recommend Ask the manufacturer to add more pockets to the vest, which would be helpful if you are carrying yourself and not carrying another item that can carry other items
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