NIKE Men's Pro Combat Core 2.0 Fitted Short Sleeve Shirt Dri-FIT fabric helps keep you dry and comfortable by wicking sweat away from the skin to the fabric's surface, where it quickly evaporates. Flat seams reduce irritation from chafing and seam stacking, and shoulder seams have been moved toward the back to avoid seam stacking and help minimize abrasion. For enhanced breathability, mesh panels are located at the back and sides, and a bit of spandex adds just the right amount of stretch for freedom of movement.