Sierra Designs All-Season Windjacket - Men39;s Constructed of 50% nylon, 39% polyester,11% spandex weave fabric with DWR Double-woven fabric is highly tear-resistant, yet has soft interior for added comfort Welded, stitch-free construction and water-resistant fabric allows this windwear to pass as light rainwear while the fabric blocks wind, yet some air-permeability dries sweat quickly Die-cut underarm vents keep you cool without the bulk and hassle of zippers Hand pockets and chest pocket are accessible with a pack on