Orthopaedic body-aid device

Orthopedic body auxiliary devices, in particular limb prostheses (31), plaster splints, air slides (41) or the like, are lined with a ventilation layer material (3) at least in the area lying on the skin of the patient, the longitudinal air conductivity in the longitudinal direction and associated transverse air conductivity at least one of its Has surfaces and is so stable in pressure that the longitudinal air conductivity is maintained during normal use of the body auxiliary device.