This Richardson cap was built for the duration; whether in a pack or on your head. Breathable mesh side panels, lightweight materials, and a soft packable visor make this cap perfect for backpacking, trail-running, or day hiking. Shape 5 Panel Unstructured Fabric Nylon Blend/Polyester Mesh Visor Soft Flex Sweatband Stay-Dri Performance R-active Function: WICKING OSFM (7 – 7 3/4) Adjustable Hook-and-Loop BackstrapElastic D-RING