I got very lucky with this product. I bought a perfect size, which for a westerner is not always so easy. Besides fitting well, this product works perfectly. It doesn't turn off unexpectedly when you move, the heating is strong enough to make you warm and feels natural. I depend on heated types of vests as I am always cold, and this one is one of the best ones I ever bought. Note that you will have to buy a battery (usb power pack) separately. I recommend a large capacity one 10,000mah/20,000mah so you don't have to worry about constantly charging it. I bought 2 different ones so I always have power available. Use one that includes the exact % of power left (from 1 to 100%) so you know how long it will work, roughly.
