100% Polyester, in black with white Starlink logo front left. Fabric is very tough and well made, flat brimmed hat with reinforced top, natural Oxford lining, comfortable and breathable. Has a plastic type buckle design on the back to allow size adjustment to freely fit head circumference. Strong, can be used in all seasons, for various activities, sports, going out, travel etc, Unisex. It is recommended to wash by hand and less frequently, do not machine wash. Due to the different measurement methods, the error of this size data is within 1-2cm, which is a normal phenomenon.