Our M12™ TOUGHSHELL™ Heated Jacket is powered by M12™ REDLITHIUM™ Battery Technology and features an advanced heat technology system that combines lightweight and durable carbon fiber heating elements, Quick-Heat functionality, enhanced fabric construction, and optimized interior liners to deliver HEAT BUILT TO OUTLAST. Our new generation TOUGHSHELL™ Stretch Polyester has been re-engineered to stretch and move as you work while being as tough as previous TOUGHSHELL™ jackets. MILWAUKEE M12 HEATED GREY TOUGHSHELL JACKET KIT – L