5.4 oz. 95% Polyester / 5% Spandex 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 15+. Stretch fabric moves with you to increase your of motion. Self fabric collar. 1/4-zip with Callaway signature zipper pull. Over lock decoration stitch on sleeve. Double needle hemmed bottom with side vents.