Powered by M12 REDLITHIUM™ Battery Technology, the MILWAUKEE M12 Heated Vest uses carbon fiber heating elements to create and distribute heat to the chest and back. Wind and water resistance combined with a thermal fleece lining provide protection from the elements and allow for three-season versatility. Reinforced with GridIron 900 Denier Ripstop Polyester to Outlast 12oz cotton duck work wear by 3X against abrasion and tear, the vest also features riveted, reinforced pockets and a tarnish resistant metal zipper to survive the job site.