Futuro Slim Silhouette Ankle Support provides good arch support and smooth design that does not \ufffddig or rub\ufffd into foot. Designed to stay in place without binding. Large heel opening provides easy application for swollen ankle. Fits 5th \ufffd 95th percentile based on women\ufffds anthropometric data. To size, measure around ankle. Offered only in Small/Medium, which fits 7.5 - 8.5" ankles