New design cap made of mesh material, free size for comfortable wear. - Brand: new balance - Color: Blue/Red/White - Size: Free size (one size) - Material: 100% Polyester - Design: Mesh cap Thank you for looking. It is free size and has an adjustable belt on the side. I believe the size would fit children up to around the lower grades of elementary school. The size is approximately 52cm based on amateur measurements. Please understand that there may be some errors. Used only once during a camping trip for one season. There is a name written on it, so I will black it out before sending. We ask for your understanding regarding the above before purchasing. No price reductions. (Even though it is stated, some people still negotiate prices, so please refrain from doing so. We will not respond to such requests.)