The Thorax model was designed specifically with pipeliners in mind. It has four rows of stitching across the chest and shoulder panels. The hood and sleeves are lined with fleece for comfort. Strategically placed leather on the side of your hood, upper torso and arms to help protect from burns, and prolong the life of your garment. By placing the leather only where you need it, it aids in cutting down the weight and bulkiness of the garment, while still delivering the protection you need.