57% nylon, 43% spandex Truform 0253; Ladies fashion style support hose; dress nylons; 30-40 strength graduated compression Soft top band will not constrict leg; Knit heel pocket keeps sock in place; Lightweight breathable Use for severe symptoms related to circulatory and vascular conditions as directed by a doctor Treats ulcers, varicose veins, lymph edema, DVT, thrombotic PTS, sclerotherapy, blood clot embolism Made in the USA; Measure according to size chart; Latex-Free; Nylon and Spandex construction