The size is 48cm-52cm, making it suitable as a first helmet. It has some signs of use, but it can be used without any problems. Selling because my child has outgrown it. This is a children's helmet featuring a rocket and star design. - Design: Rocket and star graphics - Color: Navy with colorful patterns - Ventilation: Multiple vents - Size adjustment: Adjustable straps - Brand: Nutcase Thank you for looking.