Arm positioning system made of viscoelastic foam with rigidification inserts The SYST?AM® wedge for positioning upper limbs in patients in chairs improves position compliance by developing a new concept, totally independent of the wheelchair and facilitates: adaptability to patient movements, easy transfers, simple no-tools regulation The anatomic form of the device combines memory foam with respect for the natural morphological position of the arm and hand, particularly the natural elbow/wrist angle The weight of the upper limb is transmitted directly to the thigh, not to the armrest, thus guaranteeing continued correction whatever the position and mobility of the subject The adjustment system facilitates adaptation to all sizes and morphology types Impermeable cover, suitable for incontinent patients The Syst?am wedge for positioning upper limbs in patients in chairs can be used on all chair models (static, wheelchair, electric, car seats, toilet chairs)