Columbia Men’s Pilsner Peak Print Short Sleeve Shirt Review February 28, 2019 - MusicDroid 100% Polyester Imported Button closure Machine Wash Omni-Wick Advanced Evaporation Omni-Shade UPF 50 Sun Protection Vented in Back Omni-Wick Advanced Evaporation Omni-Shade UPF 50 Sun Protection Vented in Back, Relaxed fit, Polyester material.