Asahi Cycle Kids' Helmet and Protectors Purchased from Asahi Cycle several years ago. Helmet size: 《49-54cm》 【Size Adjustment】 Features a buckle for size adjustment, allowing for a comfortable fit as your child grows. - Application: Children's helmet - Ventilation: Multiple vents - Size Adjustment: With size adjustment buckle Never experienced any impacts such as falls. There are some scratches and dirt from use. Thank you for your understanding.