The Nike AU Short Sleeve Warm-Up Top is all the motivation you need to crush your training goals! Distraction-free focus while gearing up, effortless comfort when winding down, and an uber-cool look to serve outside the gym – this Nike warm-up top keeps you confident and prepped for all that comes next. Envision a better form, a better you, and work for it in the Nike AU Short Sleeve Warm-Up Top. 100% polyester. Imported.