Nike Mens Aeroloft 800 Running Vest Down Fill (X-Large, Cargo Khaki) Ripstop fabric provides durability and wind resistance Dri-FIT mesh shoulder panels help you stay cool, dry and comfortable Elastic binding on the armholes and hem for a secure, comfortable fit Reflective details enhance visibility in low light Fabric: Body/lining: Dri-FIT 100% polyester. Fill: minimum 90% goose down.