classic size Melin hat. Amphibian California Legacy snapback hat. Fits more like a large, 58/60cm. my heads a little smaller so it's too big. One size, doesn't say cm. A super comfortable durable hat. Thanks for checking out my closet! All items are from smoke/pet-free home. Clothing items are washes in cold, and performance clothing is hung dried (washed to brand standards), and natural detergent with no dyes or fragrances. I try to ship same or next day when possible! If you have any questions or comments, leave it below! Thank you!