This NEOTech Care ankle support brace utilizes a SPECIAL KNITTING RADIAL COMPRESSION TECHNOLOGY increg the support provided to your ankle by a standard fabric itself by an extra 20% without increg the feeling of thightness This ankle brace is made of high quality fabric that is comfortable to wear and lets your skin breathe. It is ideal for those who need extra ankle support while keeping FLEXIBILITY. This protecting ankle sleeve provides focal support to the ankle and surrounding muscles. It is breathable, comfortable, light weight and it allows to be worn well in a shoe. SIZES Please measure the foot circumference S: 26-30cm (10.25-11.75) Length: 20cm M: 30-33cm (11.75-13) Length: 20.5cm L: 33-36cm (13-14.25) Length: 21cm Measurements can vary sligthly depending on measurement method: +/- 0.5cm (+/-0.25inch) Please also keep in mind when choosing the size that the fabric is stretchable.