LOWRYS FARM Casquette Hat Cap Black Men's Size: Approximately M Measurements taken with a measuring tape. Please check the photos, which have been uploaded. I think it can be worn even by those who usually wear S size. I think my head size is 53cm, but it may vary slightly depending on the amount and length of your hair. The size is shown in the uploaded photos. Please look carefully and confirm before purchasing!! No warranty is provided. Also, this item is listed elsewhere. Please confirm availability before pressing the purchase button!! Price reduction offers are not accepted. To reduce the thickness, I will flatten it as much as possible for shipping. Wrinkles should return to normal while wearing. I think it can be washed in a laundry net.