The M12™ TOUGHSHELL™ Heated Vest is powered by M12™ REDLITHIUM™ Battery Technology and features an advanced heat technology system that combines lightweight and durable carbon fiber heating elements, enhanced fabric construction, and optimized interior liners to deliver heat built to outlast. The new generation TOUGHSHELL™ Stretch Polyester has been re-engineered to stretch and move throughout work while being as tough as previous TOUGHSHELL™ products. The MILWAUKEE® heated vest has a unique battery pocket Pass-Thru design that is easy to use with front or back pocket battery placement, allowing users the versatility and comfort needed depending on the situation. The Milwaukee heated vest is a go-to for protection from the elements on the jobsite or when enjoying the outdoors.