Saphena Ae Stockings - Below Knee Large offer a cost effective, comfortable and clinically effective system to help prevent the formation of Deep Vein Thrombosis (DVT) by the application of graduated compression. Saphena anti-embolism stockings provide pressure to force blood back towards the heart with graduated compression which is strongest at the ankle and reduces further up the leg. By compressing the surface veins, arteries and muscles, they force circulating blood through narrower channels. As a result, the arterial pressure is increased, which causes more blood to return to the heart and less blood to pool in the feet.