I bought an electricly heated jacket last winter from The Warming Store (check the net) It uses rechargeable batteries. Never used it many times but it does work. I've also used something a lot cheaper, back when I was flying ULs, I bought a heated seat pad from JC Whitney. It plugs into a cigarette lighter port. $20 and it worked real good. I would slip it into my snowmobile suit and run the cord out the bottom of the front zipper. If I ran it on high for long it would cook me, mostly ran it on low. It still works, used it last winter in a plane that had lousy heat. I'm in northern Mn by the way, and fly all winter. Jim Chuk