Packable UPF Straw Sunhat Women Summer Beach Wide Brim Fedora Travel Hat 54-59CM FOLDABLE: soft straw fabric, foldable and packable for travel. DETACHABLE CHIN STRAP: adjustable for a better fit; won't blown off when it gets windy. SIZE - Small fits for 54-55CM 21.2"-21.6"; Medium fits for 56-57CM 21.8"-22.4"; Large fits for 57.5-59CM 22.6"-23.2". With an adjustable tape built in sweatband to help find the best fit. VENTILATED: perfect for beach vacation, also great for summer rides, fishing and hiking. WIDE BRIM: not only looks stylish, but also wide enough to shade uv rays effectively.