NIKE CF Convertible Running Jacket Motion Sleeves - Excess fabric has been removed, allowing you to concentrate on your run, Removable Sleeves - When things warm up, remove the sleeves and store them in the back zip Stay Cool - With a Back vent, you sure to stay cool, dry and comfortable, no matter how ha Visible - Make sure you're seen in low light conditions with reflective detailing Nike+ - MP3 device storage and cord management solutions