This is a children's helmet from Petzl, a French climbing gear manufacturer. This children's climbing and cycling helmet offers high protection. While it shows signs of use on the exterior, it should still be usable. *I wiped it down, but the exterior dirt didn't come off... My child used this when they were in kindergarten for climbing and cycling. Instant purchase OK Head circumference: 48-54cm Weight: 340g (actual measurement) The 'P'tchu' helmet is designed for children and is suitable for climbing and cycling (conforms to European and American standards). The hard shell protects against impacts and abrasions. The design covers the entire head, enhancing protection from impacts from the front, sides, and rear. The ventilation holes and the shape that fits a child's head provide a comfortable fit.