Thank you for viewing. Only tried on, never used for sports. Due to the product's construction, the Velcro easily sticks to other fabric parts, and some threads are pulled. (See images 2 and 3) ・Size M (Product length 47cm, circumference 35cm, suitable leg circumference 35-41cm) ・Velcro closure, adjustable size, easy to wear Please search for "Goosom Knee Support Super Long 2 pieces" to refer to the product specifications and precautions for use. ・No packaging box Although unused, please understand that this is a used item before purchasing. Thank you.