This heated jacket was tested by a user in Michigan, one of the coldest states in the union! The battery operated heating system keeps the wearer comfortable in the coldest weather. The battery is contained in a zippered pocket. There are a few different levels of heat. To get more great tool reviews, visit www.toolselect.com [2].
Links:
[1] http://www.youtube.com/watch?v=_X-03mSscl0
[2] http://www.toolselect.com