Outdoor Research Palma Radar Sun Cap Shell: 100% Nylon; Side Panels: 100% Polyester Imported Fabric performance: water-resistant, breathable, lightweight, wicking, Quick-Drying, transaction headband, UPF 50+ Design features: covered foldable brim, dark fabric under brim, stealth mesh panels, side vents on crown, vintage logo patch Functional details: elastic back, packable, crushable