Side mesh ventilation panels provide breathability, maintaining a cool and comfortable head. The crown and brim utilise a fabric with a cotton-like texture. 70d full dull spun-like nylon tussar w/ water repellent finish Quick-drying  Side mesh ventilation panels Back strap adjuster ensures a custom fit Loops for attaching hat strap (hat strap not included) Weight: 58g  Brim length: 5.5cm / 2.2" Head circumference: M: 56-58cm L: 58-60cm Montbell O.D. Mesh Hat - Khaki