Just got a nice Gerbings inner jacket from another inmate used. Ordered up the bike-side harness pigtail for ten bucks and off I went. Gerbings had it to me in two days, in time for a trip.
Put it under a Darien and was toasty at 30's and 40's in the mornings into upper Michigan.
The Gerbings works great. Even the collar is heated.
I am going to rig a handlebar switch so I don't have to fiddle with anything else to turn it on or off while riding.
Never had heated anything before, this Gerbings stuff seems like the ticket. The gal I talked to on the phone I spoke with talked to me in great English, and was attentive. She got me what I needed toot sweet and that was that.
Never do anything you would be uncomfortable explaining to the paramedics...