UV 50+ Talson Removable Flap Breathable Cap - Charcoal 100% Nylon Made of 100% Nylon. One size fits most, fitting up to 7 1/2. Crown measures 4 inches deep, with adjustable toggle closure, detachable double flaps in the back. Brim measures 3.8 inches long, stiff and pre curved bill. Packable and crushable.