These are supposed to be one size but I am not sure why they’re is a size M tag attached. NWOT tyle No. 31162506; Color Code:  Beautiful Greek fisherman?s cap. Denim hat with ribbon embellished brim. Silky liner at the crown and leather band. *By Aegean *While the Greek Fisherman is a well known character of the Western World, one does not need to be Greek, nor a fisherman, to wear an Aegean cap. However, a feeling for adventure and romance is a must! Care/Import *100% Cotton *Made in Greece