5.3 oz 100% polyester pique mesh stripe knit fabric. Opti-Dri technology transfers moisture away from the body to keep you cool and dry. Ventilated fabric allows air to flow freely through the fabric to keep you comfortable. Rib knit collar. 3-button placket with Callaway embossed buttons. Double needle hemmed bottom with side vents. Heat seal label provides tag-free comfort. Contrast embroidered Callaway logo on right sleeve.