Size Cap’s girth size approx 54cm Adjustable. This is a one-size- fits- most, custom made cap. Fits adults, teens and children due to the adjustable snapback plastic band. The adjustable band provides a sure fit for all sizes. I’ve tried this hat on 10 yr olds and also 6′ tall men, and it fits all of them. Medium profile cap, which means it is 4 1/2″ high white foam in front – it has the typical trucker-style mesh in back. Package One Cap . Brand new with tag.