Outdoor Research Sombriolet Sun Hat 86% nylon/14% polyester ripstop crown/Supplex 100% nylon under brim Imported Foam Stiffened Brim Floats Lightweight, protective hat for use in intense sun, heat, and humidity SolarShield construction offers UPF 50+ sun protection Vents and mesh lining in crown for cooling and moisture management TransAction headband, external drawcord adjustment, and chin cord for a secure fit Foam-stiffened brim and piping on brim edge