Built for premium performance in the outdoors, the Coolhead III Ball Cap boasts Columbia's Omni-Freeze ZERO technology which accelerates the wicking process and delivers amazing next-to-skin coolness. Ultra-durable Freezer Ice jersey fabric offers built-in UPF 50 sun protection to shield your skin against harmful rays. The Omni-Freeze advanced cooling sweatband reacts with your sweat to lower the temperature of the material. A hook-and-loop adjustment in back ensures a customized fit. 91% polyester, 9% elastane fabric blend. Imported. One size fits most.