This great lightweight jacket will protect you no matter what the elements throw your way. Full zip for easy on and off. Zip off sleeves that easily stow in the secure zip pockets for when the weather decides to warm up. Vent on back side for greater breathability. 360 degrees of reflectivity provides maximum street safety. Music pocket and cord management loop so you can jam out tangle free while taking your run. NikeFit fabrics are made with performance in mind to keep the athlete comfortable without hindering performance. Body is 100% polyester dobby, sleeves/panels are 88% polyester and 12% spandex, mesh is 80% polyester and 20% spandex. Machine washable.