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The Columbia Black Mesa Polo keeps us cool and dry on hot summer days, whether going for an afternoon stroll along the beach or a quiet hike through ancient forests. The Omni-Freeze Zero construction on the upper back features sweat-activated rings that absorb moisture and facilitate evaporation, helping quickly cool us down while we're active. The rest of the shirt is made of Omni-Wick material, which is highly breathable, moisture-wicking, and quick-drying for maximum comfort through the dog days of summer.