4.8 OZ, 70% polyester, 30% recycled polyester jersey knit fabric. Opti-Dri technology transfers moisture away from the body to keep you cool and dry. UV Block technology keeps skin safe from the sun's harmful rays. UPF 50+. Rib knit 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 TOUR logo on right sleeve.