This Riverside 6-Panel Old School Flag Cap features our lightweight performance polyester ripstop fabric with structured front panels. Coupled with our American Fit(TM) design, fitting US heads sizes MD - 2X. Traditional caps only fit sizes SM - XL. American Fit(TM) sizing is a throw back to the original American size standard established in 1929. Lastly, the hook and loop rear closure features an elastic loop for a comfortable stretch fit. Patriot Series Vintage WW2 American Flag Cap RIVERSIDE 6-PANEL STRUCTURED DESIGN AMERICAN FLAG HAT LIGHTWEIGHT POLY MICRO RIPSTOP QUICK DRY FABRIC AMERICAN FIT(TM) SIZING (Fits Men&';s MD - 2X) COMFORTSNAP STRETCH ELASTIC SNAPBACK CLOSURE ONE SIZE FITS ALL