Orthoses help to protect an unstable ankle from excessive strain. The MalleoLoc L3 orthosis can be adapted for multi-stage treatment and patients with chronic conditions: its stabilizing protection can be adjusted in three steps depending on the progress of the treatment or individual requirements. Using an L shell and securing straps, it stabilizes at the outside of the ankle. In addition, a muscle-activating compression support is integrated. The shell and straps can be removed easily. The MalleoLoc L3 provides secure support and fits in narrow everyday shoes, thanks to its slim design.