I bought 2 jackets for my 2 boys a 3x and a 2x. The 3x is a little snug on my son. Not sure it's the jacket being too snug or my son may be closer to a 4x. Anyway they both love them. The batteries do run out fast on high. They said they don't really need the jackets on high. I did get an extra battery for each of them to make it through the day of work. They work outside and said they will sweat in the cold. They said the jackets are pretty thin, not like a normal Carhart jacket that they normally wear. From the picture they looked like they were a heavy jacket. They said the jackets although thin are very warm without the heat on. They like them because they can move about. They haven't had them long enough to review how long they will last. So far it's a go! Thumbs up!