A-V Impulse??foot compression system helps to prevent Deep Vein Thrombosis (DVT) and Pulmonary Embolism (PE) by mimicking the natural hemodynamic process of walking and weight bearing. Upon every step, the plantar arch is flattened, causing an immediate evacuation of blood from the plexus of veins in the bottom of the foot. This action sends a column of blood up the leg and back to the heart. The ImPad? rigid sole foot covers are designed with a hard sole, which contains and directs the impulse to the bottom of the foot. This action mimics the natural hemodynamic effect of ambulation and has been clinically proven to reduce this incidence of VTE as well as post operative swelling and pain.