Nike Men's Rain Runner Jacket Nylon Packable design fits into back zip pocket for secure storage Articulated sleeves follow the contours of your arm to allow natural range of motion as you run. Bonded chest and back vents with Dri-FIT mesh enhance breathability while wicking sweat away, Mock neck zips up to your chin for warmth and coverage; Zip pocket at back for secure storage Fabric: Body: 100% nylon. Mesh: Dri-FIT 100% polyester.