M Size : Up Circumference : 30CM/11.8" Down Circumference : 18cm/7" Length : 45cm/17.7" Fits Suggestion :Weight< 65KG Nice workmanship, with anti slip band, no easy to fall off. The fabric is breathable and elastic, sweat can be expeled from the breathable fabric. Well portect muscles from pulling during in outdoor activities such as basketball, football, cycling, golf, baseball... Suitable for basketball badminton tennis football mountain cycling and other sports is a multipurpose knee