The Columbia Zero Rules T-Shirt keeps you cool with industry-leading Omni-Freeze Zero technology which reacts with your sweat to lower the material temperature and keep you cool during exercise. The active fit T-shirt also features Omni-Wick technology to transport moisture away from your skin. Omni-Shade UPF 30 protection block harmful UV rays while the antimicrobial finish keeps you feeling fresh. - A.D. Omni-Freeze ZERO™ - Blue rings react with sweat to lower the temperature of the fabric so you feel cooler Omni-Shade UPF 30 sun protection - Blocks UVA and UVB rays to help prevent sunburn and long-term Omni-Wick™ Modern Classic Fit Comfort stretch Antimicrobial
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