Thank you for viewing. This is a child's arm holder made of breathable mesh material. It was used by a 145cm tall, slender child. Used only when going to school for one week. It seems that the child found it easy to put on by themselves. - Size: L - Intended use: For children - For both men and women, and for either arm - Material: Mesh Immediate purchase is welcome! I think there are many cases where it is needed immediately, so I will ship it as soon as possible (please note that we do not guarantee same-day shipping).