CW-X Men&#39;s Insulator Running Long Sleeved Zip-T,Black,Large Polyester 90% / Spandex 10% Imported Long sleeve zip-T using Auto Sensor fabric moves perspiration away from skin and regulates next-to-skin temperature Long sleeve zip-T using Auto Sensor fabric moves perspiration away from skin and regulates next-to-skin temperature |4-way stretch for comfort used for high performance support under layer or on warmer days use as outer layer.|Flat seam construction for comfort Zip collar with wind flap and locking zip|Used as warm functional primary layer or outer layer depending on weather conditions|