The Columbia Sportswear Men's Super Tamiami Short Sleeve Shirt is made of 100% yarn-dyed polyester and features Omni-Shade® UPF 40 sun protection that helps prevent skin damage caused by harmful UVA and UVB rays. Omni-Wick® technology pulls moisture away from your body for dry, comfortable wear, while antimicrobial fabric works to prevent the growth of odor-causing microbes to help keep you feeling fresh. Mesh-lined vents for breathability. Button-down style. 2 chest pockets.