Columbia Sportswear Men's Big Tamiami II Short Sleeve Shirt Omni-Wick Ripstop 100% polyester Imported Omni-Wick Shirt Omni-Shade UPF 40 sun protection Antimicrobial treatment protects this product from bacterial growth Quick dry. Vented. Rod holder Omni-Shade UPF 40 sun protection Omni-Wick moisture Management Quick dry fabric Vented in back