An adjustable ankle buckle strap provides a secure and comfortable fit, while the cushy insole pads each step you take. Buckle closure; adjustable ankle strap. : Size 5= 8.50 in, Size 6= 8.86 in, Size 7= 9.25 in, Size 8= 9.57 in, Size 9= 9.88 in, Size 10= 10.20 in.