MICRO PERFORATED KNIT: 73% NYLON, 18% POLYESTER, 9% SPANDEX. JERSEY KNIT: 85% POLYESTER, 15% SPANDEEX. LIGHTWEIGHT STRETCH WOVEN FABRIC PROVIDES AN UNRESTRICTED FULL RANGE OF MOTION. UV FINISH PROVIDES UV PROTECTION. HALF-ZIP CONSTRUCTION PROVIDES AN EASY ON/OFF AS CONDITIONS CHANGE. MOISTURE WICKING TECHNOLOGY HELPS MOVE MOISTURE AWAY FROM YOUR BODY FOR ADDED COMFORT. FJ ON BACK YOKE.