Columbia Men's Super Low Drag Short Sleeve Shirt 100% Other Fibers Imported Omni-Wick technology. Omni-Shade UPF 40 sun protection. Antimicrobial treatment protects this product from bacterial growth. Quick drying. Vented. Rod holder. Omni-Wick Moisture Management Omni-Shade UPF 40 Sun Protection Trement Protects This Product From Bacterial Growth Vented in Back