The Milwaukee® 2X Black M12™ Toughshell™ Heated Jacket Kit Is Powered By M12™ Redlithium™ Battery Technology and Features An Advanced Heat Technology System. Combining Lightweight and Durable Carbon Fiber Heating Elements, Quick-Heat Functionality, Enhanced Fabric Construction, and Optimized Interior Liners, The M12™ Toughshell™ Heated Jacket Delivers Heat Built to Outlast. The New Generation Toughshell™ Stretch Polyester Has Been Re-Engineered to Stretch and Move While Being As Tough As Previous Toughshel