Abstract: A process for producing plantar orthoses or insoles taking a footprint while walking and directly molding, having the purpose of taking the plantar footprint of the patient while walking and wearing his usual shoe, and the molding of the plantar orthosis directly on the foot of the patient and immediately after having carried out the examination and issuing the diagnosis, and immediately checking if the produced insole fulfills the expectations for which it is carried out, mainly distinguishing three insoles: simple pressure relief compensating or corrective insoles; compensating or corrective insoles for the different altered biomechanics; and composite insoles, including the two previous corrections, and the obtainment of which requires isolating cotton socks; 40-gauge polystyrene socks; a vacuum melting machine; a height-adjustable vacuum cushion; wax pencil for skin, and a sheet of paper.