Keep your core warm, even on brisk, windy days with the ActionHeat® 5V Heated Vest Liner for Men. Designed to serve as an insulating layer beneath a jacket, this heated liner utilizes 3 innovative, built-in heating panels with ActionFlex material to keep your core body temperature warm and comfortable in frigid environments. Operating on a removable and rechargeable 5V battery with an LED power indicator, this liner boasts long-lasting warmth, while remaining 100% machine washable! Machine wash. Imported. Manufacturer style #: AH-VSTL-5V.