Juniper UV 50+ Talson Removable Flap UV Bucket Hat - Khaki 100% Nylon Made of 100% nylon. One size fits most, fitting up to 7 1/4. Crown measures 3 inches deep, unstructured, with chin string. Brim measures 3 inches wide. Back flap measures 7 1/2 inches long and 30 inches wide, detachable with buttons.