This baseball cap is made of polyester - cotton. Thicker material, long brim, no irritation to the skin. Comfortable and breathable. The hat has a sun visor on the front to protect your skin from uv damage. It's easier to travel in summer. Adjustable metal closure provides a flexible fit. Rear opening design fits women's low ponytail. Fits for men, women and teenagers. Your logo or design is welcome. 23 5/8" D