To be fair, this type of technology really isn't appropriate for golf, mostly because of the movement and flexibility needed to play the game. These heated devices are more for spectators who are sitting in the stands.
As an example, I have a heated jacket from an olympics back in the 1990's in Japan (Nagano). The jacket was given yo us for the skiing events when we'd be outside in the really cold temperatures. The jacket was fueled by a small butane cartridge connected to an elaborate heating element that had panels across the back and on your chest. I always felt weird puttin git on because when you consider today's realities, this thing was wired like a bomb....
Anyway, it was indeed an unbelieveably warm jacket and if it wasn't so heavy, it would have been awesome. The funniest thing about it though was this. Since it go so warm and there was literally heat coils running inside, it needed venting. People walking behind me would see smoke coming from a small hole where the venting was in the rear of the coat. It was hilarious to see people looking at me wondering what was going on.
So seriously... if it's that cold outside get a cart heater or do not go out!