Durable carbon fiber heating elements: Distribute heat to core body area and pockets3 Heat settings: Adjustable by zone to provide the right amount of heat to the hands, core and upper backRugged construction: Water and wind resistant polyester with an interior storm flap and thermal knit fleece inner lining to keep weather out and heat inPowered by the M12 REDLITHIUM Battery: Up to 6 hours of continuous heat on a single chargeVersatile battery holder: Features a battery fuel gauge and built-in USB port to charge phones and other portable electronics