●(Body Material) Unclassified fiber (paper), Ribbon: Rayon ●One-touch Adjustment: The head circumference has a built-in strap that can be adjusted with one touch via the Velcro strap, so you can wear it with a fit ●(Includes wire) The built-in wire around the brim allows you to create the shape you like and not obstruct your eyes ●Chin Strap Included: No need to worry about it being blown off on windy days or when riding a bicycle ●(Size) Head Circumference (Actual Size): Approx. 22.0 - 23.6 inches (56 - 60 cm), Depth: Approx. 4.7 inches (12 cm), Brim: Approx. 4.3 inches (11 cm) *(Please note that the measurements may vary slightly from the actual item)