Compression helps reduce swelling; enhance circulation; relieve tired, aching legs and feet; and ease discomfort from varicose veins. Graduated compression offers the highest compression at ankle and the lowest compression on top. Nylon/spandex knit. Machine wash. Made in USA. Sizes (calf circum.): M(11.5–15.5"), L(12.5–17"), XL(13.5–18"), 2X(14.5–20").