SUPERIOR MATERIALS: The Columbia Men's Tamiami Short Sleeve Shirt is comprised of 100% polyester. Machine washable and featuring a comfortable button closure, this shirt is perfect for daily use.P ROTECTS FROM EXPOSURE: This Columbia short sleeve work shirt provides the ultimate protection. Infused with Omni-Shade UPF 40 technology, this shirt provides maximum protection for long hours in the sun. ON AND OFF THE WATER: The Columbia Men's Tamiami Shirt is made for comfort and functionality while fishing or just enjoying the outdoors. Features wicking, sun-shielding fabric and a versatile look. COMFORTABLE AND BREATHABLE: This short sleeve men's shirt features our signature Omni-Wick fabric that pulls moisture away from the body. It also includes mesh-lined vents in the back that let in a cooling breeze. OMNI-WICK: The ultimate moisture management technology for the outdoors. Omni-Wick quickly moves moisture from the skin into the fabric where it spreads across the surface to quickly evaporate-keeping you cool and your clothing dry.