Size cannot be adjusted. Head circumference: 58cm (approx. 22.8 inches) It's elastic, so it stretches a little. Made of denim fabric, it looks cool and would suit American casual style. No returns. Please purchase only if you are satisfied after careful confirmation. If you do not understand, please refrain from purchasing. Please purchase only if you understand that this is a used item and are in agreement with the condition. This is an old item, so please purchase only if you understand. Please refrain from purchasing if you are nervous or seek perfection. Please check the condition in the photos. Please use the comment section for price negotiations or any questions. The condition is described for the areas that could be confirmed. There may be oversights of small stains or damage. Please purchase only if you are satisfied.