Mi12™ HEATED TOUGHSHELL™ VEST Our M12 TOUGHSHELLT™ Heated Vest powered by MIZ™ BREDLITHIUM™ Battery Technology and featuring an advanced heat technology system: combines lightweight and durable carbon fiber heating elements, Quick-Heat functionality. enhanced fabric construction, snd optimized interior liner to deliver HEAT BUILT BO OUTLAST. Our new generation TOUGHENER Stretch Polyester ins been fa transfigured to stretch and move 48 you work while being as tough as provisos TORTOISESHELL fabric.