NIKE Aeroloft 800 Women's Running Vest 546673-619 Extra Small Size Body/lining: Dri-FIT 100% polyester. Fill: minimum 90% goose down Imported The packable Nike Aeroloft 800 Women's Running Vest is designed to help keep you warm and comfortable without weighing you down. 800-fill goose down delivers superior insulation with minimal weight. It's designed to put warmth right where you need it while allowing you to move freely. Laser perforations between the down baffles allow excess body heat to escape, keeping just enough warmth in while letting moisture out. The vest can pack into the reflective zip back pocket when it's not in use. A hand strap makes it easy to carry while running. Dri-FIT mesh shoulder panels help you stay cool, dry and comfortable. Elastic binding on the armholes and hem for a secure, comfortable fit. Machine wash cold and tumble dry low (with a tennis ball to help fluff up the down)