Fabric: 100% cellulose fiber Flap: 100% polyester Imported UPF 50+ UV PROTECTION: the 4.7 brim blocks most sun UV rays effectively. Rollable & Packable – crushable, easy to pack for travel. DETACHABLE FACE MASK: provide full coverage for face, neck and shoulder. Optional CHIN STRAP – the neck cord can protect your hat from flying off in wind. One size fits most from 55-59cm 21.6-23.2 6 7/8 – 7 3/8.