This orthosis is designed to compensate the function of the missing plantar flexors. Helps straightening of the knee while standing and weighing on the front part of the foot while bending over and when in the toe-off of walking. Used when Ferrari-AFOs are too weak to handle the wear and tear caused by the weight or the activity of the user. Orthosis is made from prepreg carbon fibre. Measures are taken according to an individual cast insole and a negative cast.