THE NIKE HBR TRACK JACKET: COMFORT WITH AN ATHLETIC PROFILEpolyesterFabric: Body: 100% polyester. Rib: 98% polyester/2% spandex.Rib mock neck, cuffs and hem for a snug fitFull zip for versatility and easy on and offZip pockets for secure storageContrast tape at shoulders and sleeves for durability