This lid is made for movement. Rain, sun, heat, sweat - go head and do your thing. For trail running, paddling, hiking, or getting dirty on trail workdays. We even tried it out at The Preachers Son and church - to be clear, two different places - and they let us in to both with this hat on. But it probably feels more at home at The Hub or Pedalers Pub. Made from premium moisture wicking material, with a mesh backing, webbing adjustment, and a buckle closure. One size fits all - adjustable.