For those cold mornings, Ansai Golf has an interesting solution: outwear with three battery-powered heating panels built into them. The panels are lined with steel alloy fiber elements. Two of the panels are located on the chest, one on the back, and they can be cranked to reach 135 degrees.
It's powered by a re-chargable 7.4 volt lithium-ion battery that fits into a side pocket of the garment, which is waterproof, stretchable and breathable.
It comes in either a jacket or a vest, men's and women's, that sell for $180 (jacket) and $160 (vest).
-- John Strege