Musto Evolution Fast Dry Brimmed hat with Durable Water Repellent (DWR) coating to help water bead and run off for faster drying times, Ultraviolet Protection Factor (UPF) of 40, drawstring adjuster that keeps the hat secure in wind and brim popper fastener to keep the brim turned up when you want it out of the way.Click here to check the exact size: Size Guide