This insulated jac-shirt is a warm layer that combines the versatility of our original Jac-Shirt with the wind resistance and breathability of tightly woven cotton Cover Cloth.Dry finish Cover Cloth is lightweight cotton canvas that's been a customer favorite for several decades. The 6-oz. 100% cotton fabric is tightly woven to block cold wind while remaining quite breathable. Quilted between the inner and outer layers of Cover Cloth is lightweight polyester insulation that continues to insulate if it gets wet. The sleeves are lined with polyester twill that slides easily over layers. Hand pockets are lined with our warm signature Alaska Guide flannel cotton. Chest pockets secure with snapped flaps that are one-hand-operable. Snap-secure front closure and adjustable cuffs. Shirttail hem.