IMPORTANT Warning: To insure proper use, please review all material in this DFU. All Stifneck products should only be used by persons who have received adequate training. In case of suspected spinal injury, proper cervical immobilization is only one part of an immobilization system. It is important that the patient be properly immobilized to prevent movement of the spine (por local protocol) Do not use an improperly sized collar. Too large a collar may hyperextend a patient's cervical spine; too small a collar may not provide appropriate stability. Special sizes of Stifneck collars are available for children and others with small bodies.