AirLoc stabilizes the ankle in the shoe, for example after an acute capsular ligament injury. The plastic shells are anatomically contoured and therefore fit the foot comfortably. Inflatable air cushions allow the orthosis to be adjusted to the degree of swelling. The AirLoc stabilizing orthosis stabilizes the outer capsular ligaments of the upper ankle. It thus counteracts ankle twisting. AirLoc consists of anatomically contoured, elastic plastic shells with an integral air bladder system. The inflatable cushions exert an intermittent compression massage on the tissue around the ankle and guarantee maximum wearing comfort. Four individually adjustable Velcro fastenings make it easy to put on and take off. The slim design promotes wearing comfort in the shoe. The orthosis can be adapted to the shape and degree of swelling of the affected foot, provides reliable support with every step and is attractive and breathable.