5.3 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 50. Stretch fabric moves with you to increase your range of motion. Rib knit collar. 3-button placket with Callawa Callaway - Men's Opti-Dri Chev Polo