Black T.E.D. Anti-embolism Stockings are designed to promote blood flow with graduated compression. These compression stockings are different from support stockings in that they are used for non-ambulatory convalescing persons to prevent blood clots. T.E.D. anti-embolism stockings are clinically proven to reduce DVT up to 50% and to promote increased blood flow velocity in the legs 138% of baseline by compression of the deep venous system.