4.7 oz. polyester spandex blend jersey knit fabric. Opti-Dri technology transfers moisture away from the body to keep you cool and dry. Opti-Shield sun protection technology creates a layer of sun protection - UPF 50. Opti-Stretch fabric features interwoven layers of spandex to ensure maximum range of motion. Self-fabric collar. 3-button placket with Callaway embossed buttons. Double needle hemmed bottom with side vents