Our absolute warmest jacket! We start with RDS - Responsible Down Standard natural duck down insulation (certified and traceable), and add a high capacity 7.4volt Powersheer XL® micro heating system to produce a jacket with superior warmth and comfort, stylish enough to wear everyday, with the added bonus of performance heat when it's needed the most during extreme winter conditions. Safety tag Fieldsheer Heated & Cooling Apparel. Work and play in year round comfort.