Western Mountaineering have carefully selected the lightest fabrics and raw materials to make the new Flight series jackets. The shell fabric is a tightly woven material that weighs only 0.9 oz. per square yard! If you are looking for a lightweight, compact, and highly insulative layer, then look no further. This is the lightest down garment you will find that still has plenty of insulation in it-and it is made in the USA.