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. Thermal fabric provides an extra layer of warm comfort. Mock collar. Full zip with Callaway signature zipper pull. Over lock stitch details. Side zip pockets. Sleeve cuff with thumb hole. Heat seal label provides tag-free comfort. Heat seal Chevron on back neck.