Adaptive Breathability: Nike AeroAdapt technology uses targeted panels of sweat-activated vents that release your body?s heat during maximum exertion, then ?close? as you cool down, to help keep you at optimal temperature Made to Move: Stretchy, bonded tape on the shoulder seams adds durability while allowing you to move freely. The hem is slightly longer in the back for extra coverage Quick-Drying Design: Dri-FIT technology moves sweat from your skin for quicker evaporation to help you stay dry and comfortable. The knit fabric feels lightweight and breathable Slim fit for a tailored feel Polyester / Spandex