Keep your head covered and cool during warm-weather runs with this ultra-lightweight, mesh running hat in fun, sunny colors. Packs down for easy storage while on the go. Packable design Machine washable Unisex, one size fits most Adjustable back closure Propel Mesh: DriLayer® Seal 100% ripstop polyester Mesh: 84% Polyester, 16% Spandex Mesh To keep your Brooks gear looking and performing its best, machine wash separately in cold water before wearing, try not to use fabric softeners, and tumble dry on low heat.