Figure 8 strap offers increased stability mimicking trainers tape. Low profile design allows brace to be worn inside an athletic shoe. Strong durable breathable material. Cool and sturdy flannel and mesh combo means the patient is more likely to wear this support than some of the less comfortable supports. Non-stretch "Figure 8" nylon straps for support while the heel lock helps to prevent inversion / eversion. 13 to 14 Inch Circumference.