Designed to facilitate faster rehabilitation after an injury or operation involving the Achilles tendon, the Aircast Achilles Wedge comprises a series of four, 25mm sections that, together, make up a total height of 100mm (4 inches).All four sections may initially be used but they can be removed one by one as recovery progresses until the user is ready to resume a normal gait. Made of neoprene, the Wedges are well padded and very comfortable, and it will fit any walker with an enclosed heel.