This vest is lightweight, easy to use and true to the sizing chart. There are 3 heat levels. There is a pre-heat and after that it goes to low heat. The battery is a little heavy but to be expected. The battery is very easy to remove and charge. The pocket for the battery has an invisible zipper, so the battery pocket is not obvious. The front zipper is smooth and zips up nicely. I like the length, it falls below the waistline so it doesn't bunch up.