4.5 oz./yd² pre-shrunk 60/40 ringspun cotton/polyester Welt collar. 40+ UPF rating. Transitioning to tear away label Moisture-wicking control designed to adjust to body temperature Light Steel is 90/10 ringspun cotton/polyester. Three button placket with white pearlized buttons 4.5 oz./yd² pre-shrunk 60/40 ringspun cotton/polyester. Welt collar. 40+ UPF rating. Transitioning to tear away label. Moisture-wicking control designed to adjust to body temperature. Light Steel is 90/10 ringspun cotton/polyester. Three button placket with white pearlized buttons.