Abstract: Ankle foot orthoses (AFO) and methods of customizing an AFO. In one embodiment, the AFO includes a carbon fiber strut that includes a carbon fiber foot plate; a formable layer that is coupled with the carbon fiber foot plate, the formable layer being formable from an initial shape to a formed shape; an inner boot, where the formable layer being formed into the formed shape is configured to be formed around geometry of portions of the inner boot; and a moldable calf piece that is configured to be attached to the carbon fiber strut. The AFO may also include a strapping system that is coupled between the moldable calf piece and the inner boot. Methods of manufacturing and customizing the aforementioned AFO are also disclosed.