88% POLYESTER, 12% SPANDEX. RUNS LARGE. EASY TO CARE FOR FABRIC IS MACHINE WASHABLE WITH MINIMAL WRINKLING OR SHRINKAGE. THIS ANTI-MICROBIAL FINISH HELPS INHIBIT ODOR BUILD-UP WHEN AMBIENT MOISTURE IS PRESENT. THIS PERFORMANCE FABRIC OFFERS EXTREME COMFORT AND ALLOWS COMPLETE RANGE OF MOTION DURING THE GOLF SWING. FJ LOGO ON BACK YOKE.