Patented Nanowire™ heating technology combined with a breathable, brushed fleece polyester shell delivers comfortable, upper-body warmth at the push of a button. Ideal for layering or stand-alone wear, the performance-fit vest regulates body heat with an included 7-volt rechargeable lithium-ion battery pack. Simply connect the battery to the mating plug and adjust desired heat output with the built-in, four-level mini temperature controller. Battery pack stores inside a hidden zippered pocket. Comfortable, brushed collar lining and fleece-lined pockets. Full-zip front and a vertical chest pocket. Hem cinch pull cord. Battery is rechargeable for over 500 cycles. Includes vest and 7-volt lithium-ion battery with charger. Imported. Sizes: S-2XL. Color: Grey.