Stay warm and comfortable during your run with this great long sleeve. Dri-FIT fabric helps wick moisture away from the skin to help keep you dry and comfortable. Athletic cut for a superior fit. Flat seam construction helps prevent chafing. Nike+ pocket at lower left sleeve with tactile click wheel so you can adjust your music on the go. Audio cord-management loops keep you from tangled during your run. Reflectivity at shoulder and wrist for added street safety. 89% polyester, 8% nylon, and 3% spandex. Machine washable.