Compression stockings use gentle, graduated pressure to improve blood flow in the legs, making them tighter at the ankle and less constrictive higher up. They are used to treat and prevent conditions like swelling, varicose veins, blood clots (DVT), and chronic venous insufficiency by helping blood return to the heart more efficiently. They are also used for post-surgery recovery, during long periods of sitting or standing, and for athletes to reduce muscle strain.