Are Bikers decended from Pirates? Probably not, but if their hats look good on us, well then we'll just plunder them for ourselves! Supple black leather, with ties in back to adjust and small elasticized flap that ties go over the ties, so you never tie your hair up in the ties (I hate when that happens). Averages around 21-23" around inside, can go larger, but not much smaller than 21".