Volt Men's Cracow Heated Vest Quilted Nylon Imported 3 zone heating with 2 panels in the chest and a large back panel^80 grams of lightweight, thermally efficient polyester fiber insulation Provides up to 170 degrees of soothing heat for 2+ hours on the highest setting 3 zone heating with 2 panels in the chest and a large back panel 80 grams of lightweight, thermally efficient polyester fiber insulation Provides up to 170 degrees of soothing heat for 2+ hours on the highest setting