SCOTT helmet, size S (51.5/55.5), used. Since it's size S, it should fit women and children. I'm 160cm tall and weigh 47kg, and it fits me perfectly. I haven't worn it much, so the interior is in good condition. The exterior has some scratches because I kept it in the car trunk, and the material is matte, so the scratches are noticeable. It's a snowboard helmet, and I bought it at a sporting goods store for around 6000 yen. I've been using it recently for riding my bicycle (mountain bike).