I'm selling this item to declutter, as my child outgrew it after only using it once. This is a reversible, 100% cotton baby hat. The size can be adjusted with the string. There is no chin strap. There are no noticeable stains. Below is the description from the Miki House website: [Hat] M (44-48cm) Reversible hat with a refreshing patchwork check pattern. One side is a simple solid color made of dungaree material. The head circumference can be adjusted with a drawcord (adjustment function with string) (the drawcord is adjusted on the front side on both sides). UV cut compatible for convenience. UV protection rate (UV cut) 90% or more Please understand that this is a used item that has been in someone's hands once and is being sold at this price. We ask that those who are looking for perfection or are overly concerned about details refrain from purchasing. Please check the images carefully before purchasing.