Adjustable: Flat caps adjustable from the back between 21.6 inches - 23.6 inches (55-60 cm). One size fits most people. The newspaper seller hat is made of polyester and cotton, porous and comfortable to wear. Featuring embroidered patterns, the driver's hat is not only classic and distinctive, but it also protects you from the sun on summer days making it ideal for simple daily viewing and outdoor activities, such as: hiking, gardening, running, climbing, surfing, driving, camping, fishing, baseball, golf, tennis and other outdoor activities. The best gift for your father, husband, son, grandfather, or brother on their own days.