Vionic Wave - Unisex Orthaheel Sandals Synthetic Built-in Orthaheel Technology reduces discomfort from over pronation and flat feet. Deep heel cup helps restructure feet and improve balance/stability. EVA midsole absorbs shock and relieves pressure on knees, ankles and feet. Soft toe-post and foam-lined strap decreases the chances of irritation and blisters. Available in men\'s full sizes 5-14 and womens full sizes 6-14.