Show your support for the most important of all wilderness ethics with the Parks Project Leave No Trace Pack It Out Hat. Adorned with a custom patch celebrating the great outdoors, a portion of the sales of this hat supports the Leave No Trace Center for Outdoor Ethics. So you can feel twice as good every time you put this hat on. It's made of 100% cotton in the classic five-panel construction you know and love. The brass back clasp lets you adjust the fit.