Coolhead Zero Booney HatUPF 50+ Sun Protection Skin Cancer Foundation Recommended Fabric A battle hardened companion, Columbia Sportswear's Coolhead Zero Booney Hat is thoughtfully engineered for comfort. This classic booney hat features Columbia's proprietary Omni Shade UPF 50 broad spectrum (UVA and UVB) sun protective fabric, Omni Freeze Zero cooling technology with sweat activated blue rings that absorb moisture and enhance evaporation, and their Omni Wick dry technology
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