Unless you live in the artic you really don't need a heated jacket- Craftsman is swindling their customers by selling an electric jacket with damn near zero insulation and no shell, so any wind will cut right through that sucker and you will lose any heat generated by those heat pads almost immediately. I think people need a little more education on how to layer properly, and what does and does not constitute proper insulation. Hint: Under Armour Heat Gear(and any compression shirt advertised to keep you warm) is total garbage. So is any 'technology' companies put into their proprietary materials. All marketing gimmicks, and totally unproven in real world scenarios.
This is basically all you need for your core on a -20F day: polypropylene or wool base layer, either a synthetic or down puffy midlayer, and a nice large quilt lined carhartt with duck canvas shell. Make sure your layers are a little baggy: dead space, dead space, and more dead space for the air to warm to body temp between layers. Maybe eat a little breakfast to get your metabolic heat pumping, and you are good to go.
