A fitting is obligatory for a correct adaptation and a good understanding of the installation. The first placement will be carried out by a health professional and later by the user or a person close to him according to the same protocol. During the fitting, the applicator must conform, if necessary, the splints of the orthosis to adapt them to your morphology.1) Loosen the straps.2) Put on the orthosis like a glove by placing the whale on the side of the palm of the hand and the thumb in the space provided for this purpose.3) Adjust successively the wrist straps and adjust them so as to obtain a firm but comfortable tightening; the thumb strap must be placed without painful pressure points. 4) Then adjust the thumb strap to obtain a firm but comfortable tightening.