Alpinestars Men's Sight Mercury Short Sleeve Jersey 100% Polyester Imported Collar incorporates Lycra for added comfort on long rides 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 Mesh panels are strategically positioned under arms ensure additional airflow Garment perfectly complements other garments in Alpinestars' Sight series