A light and cool cap for intense activity in the heat, the UPF 50 armed Columbia Trail Dryer Cap is a performance trail hat featuring side vents and an advanced wicking construction to keep your head comfortable and dry. Sweat activated super cooling technology reacts with your sweat, to lower the fabric's temperature for instant and prolonged cooling. 86% polyester14% elastane shell, with 100% polyester sides, 92% polyester8% elastanne brim. Omni WICK EVAP advanced evaporation keeps you cool and comfortable at the height of sweat infused activity. Omni FREEZE ZERO sweat activated, super cooling technology Omni SHADE UPF 50 sun protection. Vented Import.