Columbia Women's Plus Tamiami Ii Short Sleeve Shirt 100% Other Fibers Imported Omni-Wick pulls moisture away from the body so sweat can evaporate quickly Omni-Shade UPF 40 sun protection Antimicrobial treatment protects this product from bacterial growth, vented Omni; Wick Rip stop: 100% Polyester Omni; Wick Rip stop: 100% Polyester Omni-Shade UPF 40 sun protection Omni-Wick moisture Management Trement protects this product from Bacterial growth