The Coolhead II Ball Cap, unisex, from Columbia will effectively protect your head from the sun's rays during your hikes, or daily activities, thanks to the Omni-Shade UPF 50 technology. Even under high temperatures and scorching sun, the mesh band Omni-Wick of the Columbia cap will keep your head ventilated while wicking away sweat. The Coolhead II Ball Cap is equipped with Omni-FREEZE ZERO™ technology. The small blue circles of Omni-FREEZE ZERO™ interact with your head. They react to sweat and lower the fabric's temperature to keep your head cool.