Columbia Sportswear Men's Big and Tall Tamiami II Short Sleeve Shirt Omni-Wick Full Dull Ripstop 100% polyester Imported Quick Dry Fabric Omni-Wick Advanced Evaporation Omni-Shade UPF 40 Sun Protection Antimicrobial, Intended to Protect the Garment From Odor Caused by Bacteria Vented in Back