What makes this hat great? Our best selling performance running cap offers an extremely lightweight design with rapid drying materials. Breathable laser venting in upper and side panels. Unstructured 5 panel construction. Pliable crushable brim makes it easy to pack away and will always regain its shape. Moisture wicking sweatband and brim. Soft and light materials give you all day comfort for running, traveling or both. Adjusting band to majority of sizes with extra elastic stretch. 58 cm 100% Polyester