Roxy Cypher Heating Jacket
Here's what other sites are saying:
Being perpetually cold sucks. Zip up the Roxy Women's Cypher Heating Jacket, crank the setting to high, and stop shivering in misery. This stretchy base- or midlayer comes with battery-operated FAR infra-red heat technology. The high/low/off settings are easily operated under your shell, and the waterproof, impact-resistant battery will last for eight hours, so you can ride all day in cold-canceling bliss.