MAYFLY fly fishing cap is on our Riverside 6-Panel cap featuring a structured front and snapback. Coupled with our American Fit sizing which fits US head sizes MD - XX. A better fit on a larger range of big head sizes. Additionally, this fly fishing cap features our Comfort Snap snapback which combines the stretch of elastic with the adjustability of a snapback for even more comfort and stretch. Lastly, the mayfly cap is available in 4 of our Cirrus patterns: Black, Grey, Blue, and Olive. RIVERSIDE 6-PANEL features a structured front panel MICRO-RIPSTOP lightweight polyester moisture wicking performance fabric COMFORT SNAP(TM) rear closure couples elastic stretch with the adjustability of a snapback AMERICAN FIT(TM) sizing fits men&';s head sizes MD - 2X ONE SIZE FITS ALL