NIKE Men's Pro Combat Hyperwarm Dri-FIT Max Fitted Mock Shirt, Gray/Black 88% polyester Mesh underarm panels enhance ventilation Flat seams move smoothly against your skin as you work out Ergonomic seams enhance your range of motion Back neck tape for durability and a clean finish Body: Dri-FIT 88% polyester/12% spandex. Mesh insets: Dri-FIT 100% polyester. Collar: Dri-FIT 84% polyester/16% spandex.