Apparatus for promoting blood flow in an extremity is disclosed including a gas source and a bladder assembly including a first bladder and a second bladder independently coupled to the gas source. The bladder assembly may be sized to fit within a shoe of a patient and may include a first bladder encircling a second bladder. A controller is operably coupled to the gas source and is configured to control the flow of gas from the gas source to the first and second bladders in order to periodically commence inflation of the first and second bladders in sequence.
