Milwaukee® M12™ Heated Jacket: Powered by M12™ REDLITHIUM™ Battery Technology, Milwaukee® M12™ Heated Jackets integrate (5) carbon fiber heating elements and advanced fabric-layering technology to distribute and maintain heat across core body areas and front pockets. Wind and water resistant, the versatile soft shell construction keeps weather out while high-loft insulation and a thermal fleece lining hold heat in to maximize warmth and reduce the number of layers needed in cold weather conditions.