This helmet was used by a child for several seasons, but is being sold because it's outgrown. There is no size indication on the helmet, but I believe it's a size M. Manufacturer's size M indication (56-58cm). With a head circumference of 54cm, the adjuster can be fully tightened. With a head circumference of 58cm, the adjuster is fully open and fits just right. The ski season is starting again this year♪ Skiing and snowboarding are safe and secure with helmet use♪ Manufacturer: TRANCE Color: Sky Blue Features (helmet): Ventilation, ear pads, adjuster