Children's ski and snowboard helmet. My daughter used this for three years, from age 6 to the second grade. Since we only went on a ski trip once a year for three years, the total number of days used is less than 10. The size is JM (51-52cm) and there is no head circumference adjustment function. As for the size, my daughter, who is currently in second grade, has a head circumference of about 52cm and it fits almost perfectly, so I think it's as the manufacturer states. There is no outer box. There are no major scratches as it has never been dropped on the ground, but there are some minor scratches. Please check the photos. I think the inner lining and chin strap are in good condition, but please refrain from purchasing if you are concerned. Thank you. ★Shipping unavailable from 2/15 to 2/21 due to a business trip.★