The Columbia Zero Rules Long-Sleeve Shirt boasts industry-leading, super-cooling technology with a feminine flair. This long-sleeve V-neck tee is crafted from soft, lightweight 100% polyester interlock fabric that's bolstered with Omni-Freeze ZERO technology, which reacts with your sweat to lower the material's temperature and keep you cool during dynamic aerobic activity in the heat. Omni-Wick technology pulls moisture away from the body so sweat can evaporate quickly, while Omni-Shade UPF 30 sun protection shields your skin against harmful UV rays. An antimicrobial finish helps reduce odors, so you stay fresher longer. Modern Classic fit. Imported.