UV 50+ Talson Large Bill Hat with Detachable Flap - White 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, detachable flap in the back. Brim measures 4 inches long, pre curved brim. Flap measures 6.5 inches long and 18 inches wide.