※ The elastic portion is 36 cm, and when fully stretched, it extends to approximately 69 cm. Simply hook the buttonholes on both ends of the belt onto the belt loops of the pants you are wearing and close the buttons. The size can be adjusted freely to accommodate your child's growth. It can be worn at a perfect size for children of any body type. It's convenient during changing clothes for gym class, and especially when using the restroom, as there's no need to remove the belt. The entire belt is made of elastic, so it stretches and doesn't feel tight around the stomach, providing excellent comfort. It can be used with pants other than school uniforms, and is suitable for both boys and girls. Thank you for viewing.