4.3 oz 100% polyester double knit Jacquard 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+. Self fabric collar. 3-button placket with Callaway embossed buttons. Double needle hemmed bottom with side vent Callaway - Men's Birdseye Polo