4.7 oz 92% polyester / 8% spandex blend 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 50. Stretch fabric moves with you to increase your range of motion. Self-fabric collar. 3-button placket with Callaway embossed buttons. Double needle hemmed bottom with side vents. Heat seal label provides tag-free comfort. Tonal embroidered Callaway logo on right sleeve.