Purchased at the San Francisco airport and stored at home. I measured the inside, and it's 52 centimeters. The images haven't been edited, so please check the condition. It's made of leather. No returns, please. Winfield Cover Co. is an American hat brand based in Pittsburg, California. Brand Information: Founded: 1976 Products: Primarily manufactures cowboy hats and western hats using suede and leather, known for its innovative western style and high quality.