5.2 oz 92% polyester / 8% spandex yarn-dyed knit jersey stripe. Opti-Dri technology transfers moisture away from the body to keep you cool and dry. Stretch to give full range of motion. UV Repel technology keeps skin safe from the sun's harmful rays. UPF 30 . Self-fabric collar with edge stitch. Double needle hemmed bottom with side vents. 3-button placket with top and bottom placket edgestitch with Callaway embossed buttons. Heat seal label provides tag-free comfort. Contrast embroidered Callaway logo on right sleeve.