Thank you for looking!✧*。 This is an opened but unused item. It is one size, but the size can be adjusted. Hugcap Bicycle Helmet SG Standard Adults and Children Unisex [Super Hard PC Material] Hugcap Students School Commute Cap Type Hat Type SG Size Adjustable Reference price 3580 yen 【Proof of practicality and safety "SG Mark Certification"】 This product is an SG mark compliant product certified by the Safety Association. What is the "SG Mark Standard"? For products certified by the Product Association, It is a unique standard in the world that provides integrated guarantees for safety standards, product certification, and accident compensation. The government encourages the use of products with the SG mark. Please choose a helmet that can firmly protect your head. For those who value style: The helmet with a matte finish has a unisex design. It can be used by a wide range of people regardless of age or gender. 【Weighs only about 290g】Certified product with "SG Mark" that ensures safety and durability, weighing only 290g. It protects firmly while reducing the burden on the head and neck. 【Adjustable with just one size!!】 Although it is a one-size-fits-all product, it can be finely adjusted with the dial on the back of the head. It supports a wide range of sizes. [Size] ●Head circumference: Reference actual size / 55.5-61.5 cm (SG standard size / 58-61 cm) Inner width / approx. 18 cm Inner depth / approx. 21.5 cm ・Weight: 290g ※ "SG standard size" is the size within the SG certification test range. ※ Reference actual measurements were taken by several of our staff. ※ The stated values include the cushion and sun visor. There may be slight errors. We appreciate your understanding in advance. *Even if the head circumference is within the range, if the width and length do not fit, the helmet may not fit properly. Please check before purchasing. 【Materials】 ・Outer material: Polycarbonate (PC) ・Inner material: Hard bead foam polystyrene (EPS) ・Other: Nylon plastic [Please be careful regarding size] *The numerical values written on the SG seal inside the product are the sizes within the SG certification test range, and will actually fit up to approximately the reference measured size.