Small head circumference (55 - 57cm / 21.75 - 22.5''); Medium head circumference (57.5 - 59cm / 22.75 - 23.25''); Large / X-Large head circumference (59.5 - 61m / 23.5 - 24''); Brim length (8cm / 3.25") Detachable chin strap Toggle for adjustable sizing Integrated high-quality sweatband for improved comfort Sun protective mesh panelling on both sides to provide cooling and ventilation Hidden pocket inside top of the crown for key storage Accredited with a UPF 50+ rating, it has the highest sun protective rating available in the world and blocks UVA and UVB rays for maximum sun protection Designed, tested, and rated UPF50+ in Australia. Made from 100% polyester UPF50+ Sturdy 8cm / 3.25" brim Weighs approximately 100 grams (3.5 oz ) Our UPF 50+ Everyday Broad Brim Sun Hat features a hidden pocket inside of the crown for key storage. It is the perfect all-rounder for all things outdoors! Our design team has worked hard to bring you what we believe is a hat combining both great style and comfort; providing superior coverage of the face, eyes, ears, and back of the neck.