5 oz 100% Polyester jersey knit fabric. Opti-Dri technology transfers moisture away from the body to keep you cool and dry. UV Repel technology keeps skin safe from the sun's harmful rays UPF 15+. 3-button placket, self fabric collar, open sleeve. Double needle hemmed bottom with side vents. Heat Seal Label provides Tag-Free Comfort. Tonal embroidered Callaway logo on right sleeve.