Closed-toe compression stockings aim to increase the blood flow in the lower extremities such as the calf, shin, and hamstring. They may also help reduce swelling and pain. Plus, they may work to prevent varicose veins and deep vein thrombosis (DVT). DVT is when a blood clot forms deep in the leg that can potentially lead to an embolism if that clot breaks loose and travels throughout the body, eventually getting stuck somewhere dangerous. Vascular compression stockings help the arteries to relax causing more oxygen to reach the muscles and the veins to circulate blood to and from the heart more effectively.