I too ride (my motorcycle) year round and have a full compliment of electric gear. It works great and that is a pretty good idea. However, if you are just looking at a vest, Milwaukee tools makes a jacket with a built in heater, much like the electric vest that I have for the bike. It works off of a 12v battery. Theyre a bit pricey, about $200 at HD. My first vehicle, '65 ford pickup had no heater, I just toughed it out in the winter and kept the girls close by!