Extra large form fitting compression stockings are medical products that help to control varicose veins and relieve tired aching legs. Anti embolism stockings are ideal for people who spend a lot of time on their feet. One-way stretch Lycra material. Measure calf to determine stocking size. Made in USA.Small: 13"-14"Medium: 15"-16"Large: 17"-18"Extra Large: 19"-20"