Designed to deliver extra warmth and durability, our North Bay heated liner is equipped with a two layer Polyester bonded fleece, a back cire Nylon shell at shoulders and four heating pads.; ; 100% Polyester 2 layer bonded fleece Back cire Nylon ripstop shell at shoulder and center back 12V quad-zone heating module Large heating pads 3 level temperature control 1 vehicle battery harness Water resistant chest pocket Machine washable