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 5-button placket with Callaway embossed buttons Rounded bottom with double needle stitching and side vents Heat seal label provides tag-free comfort Contrast heat seal Callaway Cheveron logo on back neck