Columbia's lightest-weight fishing shirt now comes in a crisp yarn-dye wicking fabric, and mesh-lined ventilation at center back for the ultimate in cool-wearing comfort. Omni-Shade UPF 40 provides maximum protection Omni-Wick technology Hidden vents at shoulders add bonus breathability Mesh-lined vent at center back Antimicrobial treatment to protect shirt from bacterial growth Quick dry Classic fit 100% Polyester Men's Columbia Super Tamiami Short Sleeve Shirt