UV 50+ Talson Large Bill Flap Hat with Detachable Inner Flap - Olive 100% Nylon Made of 100% Nylon. One size fits most, fitting up to 7 1/2. Crown measures 3.5 inches deep, with adjustable strap closure, crown comes with flap and detachable inner flap. Brim measures 4 inches long, flat brim. Back flap measures 7 inches long and 15.5 inches wide.