My girlfriend wears Medium, I got Large.
Amazing cardigan, as it really warmed her up. Just what you need for people who get polar shock in the winter

I didn't expect it to work so well! On a naked bike with an outside temperature of -1 and with a motorcycle jacket on top, I didn't need to set it to the third level

For its price, it is good even just as a jacket, but the heating elements are quite small compared to the photos, it has two in the front and three in the back but they are almost the size of a smartphone, so the heat does not spread easily in the jacket

181 150 kilos and I got into the biggest size but it's tight. In the morning with -3, -5 it helps me get to work on the bike and I don't shiver. I'm not the type who wears thick jackets and gloves and scarves. A simple thin jacket so I can move and this underneath and it really saved me. I washed it as instructed and it held up. Even if it lasts just one winter, it's worth it

I bought it purely for work... because my work clothes were done for @@@@... I needed 2 large powerbanks to get through 8 hours on medium setting, it did its job. Obviously, I wasn't burning up nor was I walking around relaxed... still had jackets and such BUT it keeps the vital points warm (mainly the core), which means I got through a very heavy winter without getting sick, it does its job very well

I have had it for 1 month and I have the following to say:

1) I press the button to open it and sometimes it doesn't open for hours.
2) After it starts working, it heats up for 10 minutes and then shuts off on its own at the highest setting.
3) Even though I got the largest size, the vest still fits me like it's too small (probably because I weigh 72 kilograms and not 85 with a belly).

I wouldn't buy something like this again, even though when it works, it feels like you're being fried. It's very powerful, but what can I do if it works one time and not the other.

For its price, it is good as a gadget and to impress your friends. It heats up a lot on the high setting, but it only has one resistance at the back, and four lower ones in the pockets and waist area. Its major drawback is that it is not windproof at all.

I am a delivery person and I wear it all winter. It is very warm and without needing to turn it on, if I get cold, I turn it on

Very good for its price.

Maybe something that some people might find negative is that it starts to heat up intensely first from the right side, on the first right thermal plate that is in the pocket and then on the rest, but after a while I judge that it's fine.

The fabric is soft and warm.

Also, something important, the power bank you will need should be good (probably 10,000 mAh and above?), you can connect a good one to the socket with the micro USB cable to warm it up before wearing it, but it won't be the same as warming up while wearing it using a power bank

It's a great vest!
There are three categories of vests currently on the market.
Fleece, lycra, and neoprene.
This one belongs to the fleece category.
I didn't want neoprene because it smells, and lycra is windproof but since it is worn internally, it doesn't matter.
This one is very lightweight, soft, and warm on its own. With a thermal layer, this and a jacket, you are fully warm.
It takes about 3 to 5 minutes to start feeling the warmth.
Once you connect it to a power source, it lights up immediately. Despite the colors of the button mentioned on the packaging, it lights up as follows: blue, green, red, which correspond to different temperature intensities.

I haven't tested the durability of the vest and the PowerBank.

Very good vest, soft, easy to wear, and warm on its own even before the heating is turned on.
Three temperature levels, very good performance in the cold, if worn over another garment you don't feel it burning or anything annoying, you just feel warm, comfortable, and without realizing that it's working.
Fleece material on the outside, lining on the inside, quality cable, three-position push switch (corresponding to low, medium, high intensity), and washable, not allowed to be squeezed or put in the dryer. You wash it and hang it to dry.
Time will show its durability, but if nothing gets burned, its price is very good...

For its price, it is a good quality product. Its cable is quite good and won't easily break.... And it heats up quite well, if you put something on top of it, it will keep you warm in the cold... Personally, I work outside in the cold and I am satisfied. Also, if you buy it, check the size chart in the photos