I crocheted this hat from yarn that was dyed and spun by myself. The lacy design makes it perfect for all but the very warmest or very coldest days. It is 20 inches in diameter, but will stretch to 22 to 23 inches. Because this hat is made from wool, it cannot be washed in the washing machine. Please wash by hand, then lay flat to dry. All of my items are made in my smoke free home, I do have a guinea pig but she doesn't crawl all over my yarn! International buyers, please contact me for a shipping quote.