Alpinestars Men's Sight Speedster Short Sleeve Jersey 100% Polyester Imported Stretchable poly-fabric main shell has excellent moisture-wicking and is quick-drying for optimized temperature control. Ergonomically designed for a contoured racing fit and easy integration with elbow and back protectors. 3/4 length sleeve design for use in warmer conditions. Mesh panels are strategically positioned under arms ensure additional airflow. Collar incorporates Lycra for added comfort on long rides.