Opti-Dri technology transfers moisture away from the body to keep you cool and dry. Opti- Shield technology creates a layer of UPF 30 protection from the sun’s harmful rays. Heat seal label provides tag-free comfort Rib birdseye collar with tipping 3-button placket with Callaway embossed buttons Double-needle hemmed bottom with side vents Tonal embroidered Callaway logo on right sleeve.