I purchased this new about three months ago. It has only been tried on by my child indoors, so I am listing it as unused. It's larger than kids' sizes, but slightly smaller than standard adult sizes. I think it would be suitable for children from upper elementary school age and up. Size: S size (54-58cm) ※ There is no "S size" notation on the product itself, but I have selected S size for listing on Mercari's system.