Nail head fleece fabric: 100% polyester. Experience adaptability during intense outdoor activities with the Merrell Apparel Fractal lightweight jacket. This men's technical top is made from super-soft nail head fleece, with a subtle texture and versatile heat retention in varying conditions. Merrell's M-Select REGULATE technology reflects and regulates body heat. Ribbed cuffs and side panels provide easy on/off and a stretchy fit.