Nike Aeroloft Flash Jacket Men's Running Reflective Vest 689168 657 Medium Ripstop fabric provides durability and wind resistance Laser perforations let excess heat escape Dri-FIT mesh shoulder panels help you stay cool, dry and comfortable Elastic binding on the armholes and hem for a secure, comfortable fit Fabric: Body/lining: Dri-FIT 100% polyester. Fill: minimum 90% goose down.