This is a reversible casquette. The size is 55cm. It's a good size for women. It's reversible with a denim-like fabric and a plain light blue. The denim-like fabric is 100% cotton. The light blue fabric is also likely cotton, but it's unknown. Both are made of knit fabric. Interfacing is used in the brim. The band is ribbed. The band is black. It fits snugly without being tight. Pattern: An-no-ki We recommend hand washing or using a laundry net when washing.