NIKE training sleeves provide comfort and support during physical activity. Dri-FIT technology and UV protection help keep skin dry and protected, while the stretchy material conforms to your arm for unrestricted movement. Key features: Dri-FIT technology wicks away moisture and provides comfort. UV protection from the sun's rays. Flatlock seams and a stretchy construction provide complete freedom of movement. Technical specifications: Material composition: 80% polyester, 15% spandex, 5% silicone