Siggi Womens UPF50+ Wide Brim Visor Cap Packable Cotton/Linen Free Size 100% Linen. One size fits most from 55-59cm 21.6"-23.2" 6 7/8 - 7 3/8 with elastic band at back. ROLLABLE: packable for hiking, travelling, gardening, boating or beach vacation. VERSATILE: the veil design could turn it to be a cool visor or a brim cap with better coverage. UPF50+: 5.1" wide brim provides brilliant sun protection. Lightweight: it has excellent breathability and sturdy framework.