Patagonia bucket hat featuring a fish pattern on a blue background. Reversible, so you can wear it either way. - Brand: patagonia - Design: Fish pattern on a blue background - Style: Bucket hat - Colors: Blue, White, Red Thank you for viewing. The chin strap has Velcro for adjustment. There are buttonhole-like holes for the chin strap, so it can be used with either pattern. Since there are no tags, this is a rough measurement, but I think it's around ~48cm. Thank you.