Small is for short hair, Med is for med big hair and Large is for long or big hair.  Please let me know the size you need. Please feel free to ask any questions you may have. They are made of 100% cotton. They have a cord lock on them so they are adjustable.  I do combine shipping . If I don't have what you want listed ask I may have it or can get it for you.  These hats are made by me and I sell lots of them . Please feel free to ask any questions you may have. They are made of 100% cotton. They have a cord lock on them so they are adjustable. I do combine shipping. Will refund overage in shipping anything over a dollar.