100% polyester. A relaxed, easy fit works together with moisture-wicking fabric to help keep sweat off your skin when your training heats up. Dri-FIT technology moves sweat from your skin for quicker evaporation--helping you stay dry and comfortable. Zippered side pockets let you secure your essentials. Full-zip design lets you personalize your coverage. Standard fit for a relaxed, easy feel. AK customisation included.