I just bought this recently for my family, and it's brand new, only tried on. I bought it for my child who usually wears 54-56cm, but it was too big, so I'm unfortunately selling it. There's no size label, but it was sold as approximately 57-58.5cm. There's no adjuster, and the back is partially ribbed and stretchy. The material is 100% cotton, which feels good against the skin, and the fabric has a slightly bumpy texture. The 6th photo shows the fabric clearly. The lining is mesh. It's sold as a unisex item, with a simple design that's easy for both men and women to wear. If anyone can use it, please consider purchasing. There was no special box originally, so I will put it in a bag, take measures to prevent water damage, and ship it via Mercari's mail service. AI-generated description: White cotton hunting cap. - Color: White - Style: Hunting cap - Material: Cotton Thank you for viewing. Color: White系 (White-based) Material: Cotton Condition: No stains, tears, or odors.