5.8 oz/yd? 65% cotton, 35% polyester; RS Sport Grey is 90% ring spun cotton, 10% polyester; Wicking properties; UPSF 50+ (White is 30+); Side seamed with side vents; Self-fabric collar; Tear away label; Clean finished placket with reinforced bottom box; 3 color-matched pearlized buttons; Single-needle topstitched shoulders and armholes; Double needle sleeve and bottom hems