Ottobock®'s C-Leg®  4 continues  the industry-leading tradition of improving outcomes for more than 60,000 fittings worldwide. With studies citing increased stability and reduced falls*, the C-Leg 4 is weatherproof, can be controlled with the Android Cockpit app, and makes walking backward easier. Whether on sidewalk steps or dodging subway crowds, the C-Leg 4 helps transform the way you walk.