Columbia Sportswear Men's Low Drag Offshore Short Sleeve Shirt 100% Polyester Imported Omni-Wick product Omni-Shade UPF 40 sun protection Antimicrobial treatment protects this product from bacterial growth, quick Dry Vented for comfort Rod holder Omni-Shade UPF 40 Sun Protection Omni-Wick Advanced Evaporation Antimicrobial, Intended to Protect the Garment From Odor Caused by Bacteria Quick Dry Fabric