The size is M, but it runs small, so I think even those who usually wear S size would be fine. (Below, from the official website) Easy-to-use 7/10 length leggings. Made with the same material as leotards, it's well-made. They fit snugly and have a second-skin feel on your legs! Approximately 90% cotton-based, so they are gentle on your skin even when worn directly. The beautiful colors seem to be useful not only for lessons but also for various other occasions.