Coolibar UPF 50+ Unisex Convertible Boating Hat - Sun Protective Never worn & new with tags! Here is the product description from the Coolibar site: Travel friendly, crushable and packable; Internal cooling mesh sweatband, covered mesh panel on back crown for ventilation, neck drape folds into back under brim and snaps in place, elastic cord and toggle at back for adjustability Approx. Circumference: 23 inch (M/L) 3 1/4 inch front and back brim 2 3/4 inch side brim Drape length: 9 3/4 inches