I have received my 12 volt heated under jacket (a few days ago),,,,,,,,,
Today I made the necessary wiring and connections on my shooting rig and have just done the initial test run.
Although not absolutely freezing outside,,, it is quite chilly.
Just running on the lowest setting possible it's bloody beaut.
Warming the entire back including the kidney area,, entire front,, full length of arms,, and the collar.
And that was without anything like a shirt or coat over it.
Will try again late tonite when it gets frosty,,,, but I can't imagine ever having to use the higher settings.