It's useful, the heat points work except for the last one which tends to mark with less heat, but still the back and abdomen work perfectly. Buy two sizes larger and it fits perfectly. We went from L to XXL and it turned out very well.
The jacket is quite good, it is made of good materials and its construction is quite solid. It warms a lot and when you use it with a Power Bank, it gets hot. Now I want to clarify that it doesn't give the same heat as a bed warmer that draws its energy from the electrical grid, don't expect something like that. It draws its energy from batteries that are in a Power Bank, and depending on how good it is, it will affect how much heat it provides. It's a very good jacket, it's not miraculous. I recommend it 100%. I am 1.7 meters tall and weigh between 80 to 85 kg. I ordered a 3XL but should have ordered a 2XL. I will buy another one again.
Quite decent quality and delivered quickly, there are three levels of heat adjustment separately for zones, back, stomach, chest, and neck. Size 4X for my height 172 and weight 95, a bit too big, it would be better if it was a bit smaller, but smaller is still okay. With a better fit, there is improved thermal efficiency. Maximum consumption, 2.2 A at 5V. So the power bank needs to have a capacity of at least 15 watts. The photo shows consumption at maximum, medium, and minimum power of all heaters. From the shortcomings: 1. there is no switch, only unplug from the power bank 2. It's inconvenient to live off the power strip, only through an extension cord if it doesn't cut off the power.
