Polyester-cotton canvas. this baseball cap is perfect for everyday out in sun, large curved visor and anti-UV fabric could prevent the UV from damaging the skin of body excessively. One size fits most with adjustable hook. Suit for men, ladies and teens. Head Circumference: 22-23.6 inches. Brim Length: 4.13inches / 10.5cm. This quick dry sun hats is super lightweight and soft. Cotton material is extremely breathable and comfortable. Complies with CPSIA