I loved the design because it was so cute, but I'm selling it because my child outgrew it. This is a size S-M for 3-6 year olds. It has been used for several years, so there are scratches, dirt, fading, scuffs, etc. The helmet itself is well-made, so I believe it can still be used. Please check the condition in the photos and purchase with the understanding that this is a used item that a child has used. --- Quoted from the official website below --- Kids Girls Helmet (Recommended age 2-6 years) The recommended age is a guideline. We recommend measuring your child's head circumference and checking if it fits the recommended head circumference dimensions in the size chart. The NINA (Nina) is a girls' model with "cute" as its keyword, offering safety, comfort, and cuteness. It is finished with pop colors and designs that girls love. Equipped with bern's unique ZIP MOLD + technology, it achieves high impact resistance and a lightweight, comfortable fit. The visor-equipped inner around the head, which tends to get sweaty, can be removed and washed, allowing you to keep the helmet clean. It also features an EZ-FIT inner system at the back of the inner that allows for easy size adjustment with Velcro. You can easily adjust the fit as your child's head grows. It supports everything from bicycle commutes to active scenes like balance bikes. S-M Recommended head circumference: 51.5-54.5 cm Kids Helmet Bicycle